AP State Syllabus AP Board 9th Class Maths Solutions Chapter 12 Circles Ex 12.1 Textbook Questions and Answers.
AP State Syllabus 9th Class Maths Solutions 12th Lesson Circles Exercise 12.1
Question 1.
Name the following from the given figure where ’O’ is the centre of the circle.
i) \(\overline{\mathbf{A O}}\)
ii) \(\overline{\mathbf{A B}}\)
iii) \(\widehat{\mathrm{BC}}\)
iv) \(\overline{\mathbf{A C}}\)
v) \(\widehat{\mathrm{DCB}}\)
vi) \(\widehat{\mathrm{ACB }}\)
vii) \(\overline{\mathbf{A D}}\)
viii) Shaded region
Solution:
i) \(\overline{\mathbf{A O}}\) – radius
ii) \(\overline{\mathbf{A B}}\) – diameter
iii) \(\widehat{\mathrm{BC}}\) – minor arc
iv) \(\overline{\mathbf{A C}}\) – chord
v) \(\widehat{\mathrm{DCB}}\) – major arc
vi) \(\widehat{\mathrm{ACB }}\) – semi circle
vii) \(\overline{\mathbf{A D}}\) – chord
viii) Shaded region – Minor segment
Question 2.
State true or false.
i) A circle divides the plane on which it lies into three parts. ( )
ii) The area enclosed by a chord and the minor arc is minor segment. ( )
iii) The area enclosed by a chord and the major arc is major segment. ( )
iv) A diameter divides the circle into two unequal parts. ( )
v) A sector is the area enclosed by two radii and a chord. ( )
vi) The longest of all chords of a circle is called a diameter. ( )
vii) The mid point of any diameter of a circle is the centre. ( )
Solution:
i) True
ii) True
iii) True
iv) False
v) False
vi)True
vii) True