Practice the AP 7th Class Maths Bits with Answers 5th Lesson Triangles on a regular basis so that you can attempt exams with utmost confidence.

## AP Board 7th Class Maths Bits 5th Lesson Triangles

Multiple Choice Questions:

Question 1.

A. simple closed plane figure formed by three line segments is called ___________

(A) Angle

(B) Triangle

(C) Rectangle

(D) Square

Answer:

(B) Triangle

Question 2.

Triangle has ___________

(A) 3 sides

(B) 3 angles

(C) 3 vertices

(D) all of the above

Answer:

(D) all of the above

Question 3.

A triangle with two equal sides is called ___________ triangle.

(A) Isosceles

(B) Equilateral

(C) Scalene

(D) Obtuse angled

Answer:

(A) Isosceles

Question 4.

A triangle with no two sides are equal is called ___________ triangle.

(A) Isosceles

(B) Equilateral

(C) Scalene

(D) Obtuse angled

Answer:

(C) Scalene

Question 5.

A triangle with all acute angle is called ___________ triangle.

(A) Right angled

(B) Obtuse angled

(C) Acute angled

(D) Equilateral

Answer:

(C) Acute angled

Question 6.

Sum of the interior angles of a triangle is ___________

(A) Two right angles

(B) One straight angle

(C) A & B

(D) None

Answer:

(C) A & B

Question 7.

In a triangle sum of its any two interior angles is equal to ___________

(A) 90°

(B) 180°

(C) Interior angle

(D) Exterior angle

Answer:

(D) Exterior angle

Question 8.

The sum of the lengths of any two sides of a triangle is ___________ the length of the third side.

(A) greater than

(B) less than

(C) equal to

(D) all of the above

Answer:

(A) greater than

Question 9.

The difference of the lengths of any two sides of a triangle is ___________ the length of the third side.

(A) greater than

(B) less than

(C) equal to

(D) all of the above

Answer:

(B) less than

Question 10.

In ∆PQR, PQ – QR ….. PR

(A) >

(B) <

(C) =

(D) ≠

Answer:

(B) <

Question 11.

In any triangle the opposite side to the smallest angle is ___________ the other two sides.

(A) bigger than

(B) equal to

(C) smaller than

(D) None

Answer:

(C) smaller than

Question 12.

In a triangle the perpendicular line segment from any vertex to it’s opposite side is called ___________

(A) side

(B) diagonal

(C) altitude

(D) hypotenuse

Answer:

(C) altitude

Question 13.

A triangle can have atmost ___________ right angles.

(A) 1

(B) 2

(C) 3

(D) 0

Answer:

(A) 1

Question 14.

Altitude of an obtuse angled triangle lies ___________the triangle.

(A) inside

(B) outside

(C) on the triangle

(D) all of the above

Answer:

(B) outside

Question 15.

In ∆ADI, AD = AI and ∠D = 45°, then the triangle is ___________

(A) Isosceles and acute angled

(B) Isosceles and obtuse angled

(C) Equilateral

(D) Isosceles and right angled

Answer:

(D) Isosceles and right angled

Question 16.

One of the exterior angles of a triangle . is 120° and the interior opposite angles are in the ratio 2 : 3, then the angles are ___________

(A) 72°, 48°, 60°

(B) 70°, 50°, 60°

(C) 73°, 47°, 60°

(D) 75°, 40°,’ 65°

Answer:

(A) 72°, 48°, 60°

Question 17.

In the figure x°, y° are =___________

(A) greater than

(B) less than

(C) equal to

(D) all of the above

Answer:

(A) greater than

Question 18.

In the figure a° are = ___________

(A) 45°

(B) 55°

(C) 90°

(D) 35°

Answer:

(C) 90°

Question 19.

From the given figure ∠b = ___________

(A) 130°

(B) 60°

(C) 20°

(D) 120°

Answer:

(D) 120°

Question 20.

From the given figure ∠x – ∠y = ___________

(A) 70°

(B) 20°

(C) 40°

(D) 50°

Answer:

(C) 40°

Question 21.

In a right angled triangle one is 43°, then the third angle is ___________

(A) 45°

(B) 47°

(C) 57°

(D) 37°

Answer:

(B) 47°

Question 22.

In ∆PQR, PQ = PR, then ∠Q = ___________

(A) 45°

(B) 47°

(C) 57°

(D) 37°

Answer:

(A) 45°

Question 23.

Which of the following measurements form a triangle ?

(A) 4 cm, 4 cm, 8 cm

(B) 5 cm, 6 cm, 11 cm

(C) 7 cm, 11 cm, 4 cm

(D) 7 cm, 8 cm, 9 cm

Answer:

(D) 7 cm, 8 cm, 9 cm

Question 24.

Two angles of a triangle are 75° and 35°, then the measure of third angle is

(A) 35°

(B) 45°

(C) 70°

(D) 75°

Answer:

(C) 70°

Question 25.

In the adjacent figure, if ED ∥ AB, ∠A = 60° and ∠B = 80°, then ∠BCD = ___________

(A) 140°

(B) 80°

(C) 60°

(D) 20°

Answer:

(B) 80°

Fill in the blanks :

Question 1.

A triangle divides the plane into ___________ parts.

Answer:

3

Question 2.

Triangle has ___________ vertices.

Answer:

3

Question 3.

If all the sides of a triangle are equal, then it is called ___________

Answer:

Equilateral Triangle

Question 4.

A triangle with one right angle is called ___________

Answer:

Right angled triangle

Question 5.

A triangle with one obtuse angle is called a ___________

Answer:

Obtuse angled triangle

Question 6.

According to the measure of angles, triangles are classified into ___________

Answer:

3 types

Question 7.

Sum of the interior angles of a triangle is ___________

Answer:

180°

Question 8.

An exterior angle of a triangle is equal to the sum of its ___________

Answer:

Opposite interior angles

Question 9.

In ∆ABC, AB + BC ___________ AC.

Answer:

>

Question 10.

In any triangle the opposite side to the biggest angle is ___________ the other two sides.

Answer:

biggger than

Question 11.

The sides which are opposite to equal angles are ___________

Answer:

also equal

Question 12.

Exterior angle of an equilateral triangle is ___________

Answer:

120°

Question 13.

Altitude of a right angled triangle lies ___________ the triangle.

Answer:

inside

Question 14.

Sum of the exterior angles of triangle is ___________

Answer:

360°

Question 15.

If one acute angle of a right angled triangle is 20°, the other angle is ___________

Answer:

90°

Question 16.

From the given figure ∠a = ___________

Answer:

80°

Question 17.

If the measure of two angles of a triangle are 35°, 84°, then the third angle is ___________

Answer:

61°

Question 18.

Three angles of a triangle are (x + 30°), 2x, (3x – 30°), then x = ___________

Answer:

30°

Question 19.

A triangle can have ___________ right angles.

Answer:

1

Question 20.

A triangle can have ___________ obtuse angles.

Answer:

1

Question 21.

In an isosceles triangle the non-equal angle is 40°, then equal angles are ___________

Answer:

70°, 70°

Question 22.

The angles of triangle are in the ratio 2:3:4, then the largest angle is ___________

Answer:

80°

Question 23.

In ∆PQR, PQ = PR; ∠P – 50°, so, ∠Q = ___________

Answer:

65°

Question 24.

The angles of a triangle are x, 2x and 3x + 60°, then x = ___________

Answer:

20°

Question 25.

The side which is opposite to right . angle in the right angled triangle is called ___________

Answer:

Hypotenuse

Match the following:

Question 1.

Group A | Group B |

1. Equilateral triangle | (A) all are acute angles |

2. Isosceles triangle | (B) one angle is 90° |

3. Scalene triangle | (C) all sides are equal |

4. Acute angled triangle | (D) one angle is obtuse |

5. Obtuse angled triangle | (E) two sides are equal |

6. Right-angled triangle | (F) sides are different in length |

Answer:

Group A | Group B |

1. Equilateral triangle | (C) all sides are equal |

2. Isosceles triangle | (E) two sides are equal |

3. Scalene triangle | (F) sides are different in length |

4. Acute angled triangle | (A) all are acute angles |

5. Obtuse angled triangle | (D) one angle is obtuse |

6. Right-angled triangle | (B) one angle is 90° |

Question 2.

Group A | Group B |

1. Ratio of the angles of triangle are 1 : 2 : 3, then angles are ___________ | (A) 36° |

2. In right triangle, one of the acute angle is 54°, then other is ___________ | (B) 180° |

3. In ∆KLM, KL = KM and ∠K = 80° then ∠L = ___________ | (C) 120° |

4. Each exterior angle of an equilateral triangle is ___________ | (D) 30°, 60°, 90° |

5. Sum of the interior angles of a triangle = ___________ | (E) 50° |

Answer:

Group A | Group B |

1. Ratio of the angles of triangle are 1 : 2 : 3, then angles are ___________ | (D) 30°, 60°, 90° |

2. In right triangle, one of the acute angle is 54°, then other is ___________ | (A) 36° |

3. In ∆KLM, KL = KM and ∠K = 80° then ∠L = ___________ | (E) 50° |

4. Each exterior angle of an equilateral triangle is ___________ | (C) 120° |

5. Sum of the interior angles of a triangle = ___________ | (B) 180° |