AP State Syllabus AP Board 8th Class Maths Solutions Chapter 13 Visualizing 3-D in 2-D Ex 13.1 Textbook Questions and Answers.

## AP State Syllabus 8th Class Maths Solutions 13th Lesson Visualizing 3-D in 2-D Exercise 13.1

Question 1.

Draw the following 3-D figures on isometric dot sheet.

Solution:

Question 2.

Draw a cuboid on the isometric dot sheet with the measurements 5 units × 3 units × 2 units.

Solution:

Question 3.

Find the number of unit cubes in the following 3-D figures.

Solution:

Figure | No. of cubes |

i) | 2 + 3 = 5 |

ii) | 2 × 4 + 1 = 9 |

iii) | 4 + 16 = 20 |

iv | 1 + 4 + 9 = 14 |

Question 4.

Find the areas of the shaded regions of the 3-D figures given in question number 3.

Solution:

Figure | Area of the shaped regions |

i) | 3 × 1 × 1 =3 Sq. Units. |

ii) | 4(2 × 1) + 1 = 9 Sq. Units. |

iii) | 4 + (16 – 8) = 4 + 8= 12 Sq. Units. |

iv) | 1 + (4 – 1) ÷ (9 – 4) = 1 + 3 + 5 = 9 Sq.Units. |

Question 5.

Consider the distance between two consecutive dots to be 1 cm and draw the front view, side view and top view of the following 3-D figures.

Solution: