Apps. and Interpretation for IBDP Maths Ebook 1 | Page 179

3. The following diagram shows a circle with centre O and radius 11 cm.
13
The points A , B and D lie on the circle. The point C is outside the circle, on OC .
Angle ACB � 21 and angle AOB � 40 .
(a) Find the length of AC .
(b) Find the length of OC .
(c) Find the area of region ADBC .
[3]
[4]
[6]
4. The following diagram shows a circle with centre O and radius 28 cm.
The points A , B and D lie on the circle. The point C is outside the circle, on OC .
AC � 47 cm and angle AOB � 63 .
(a) Find the size of the angle ˆ ACB.
(b) Find the length of OC .
(c) Find the perimeter of region ADBC .
[3]
[4]
[4]
169
www.seprodstore.com