Page 1 - Worksheet 2 Ch.10 Circle

SAI INTERNATIONAL RESIDENTIAL SCHOOL
Class: IX
Subject -Mathematics

Worksheet No.2 ( Circle)
Topic: Angle subtended by an arc, cyclic quadrilateral
Section A
Choose the correct option:

1 In Fig.10.4, if ABC = 20º, then AOC is equal to: 1
0
(A) 20º (B) 40º (C) 60º (D)10

2 In figure, if AOB is a diameter of the circle and AC = BC, then CAB is equal to 1

(A 30° (B) 60° °
(C) 90° (D) 45°

3 if OAB = 40°then ACB is equal to From Eq. (i) ACB = ADB = 70° 1

(A) 50° (B) 40° (C) 60° (D) 70°

Fill in the Blanks:
4 if DAB = 60° ABD = 50°, then ACB is equal to ______ 1

5 ABCD is a cyclic quadrilateral such that AB is a diameter of the circle circumscribing it 1
and ADC = 140°, then BAC is equal to ____

Answer the following
2
2
6 If AOB is a diameter of a circle and C is a point on the circle, then AC + BC = AB 2 1
Give Reason.