Apps. and Interpretation for IBDP Maths Ebook 1 | Page 167

(a) Find the perimeter of sector OABC .
(b) Find the area of sector OABC .
3. The following diagram shows a circle with centre O and radius 8.6 cm.
[4]
[2]
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The points A , B , C and D are on the circumference of the circle such that the length of
the arc ABC is 9.46 cm.
(a) Find the value of � .
(b)
Find the area of sector OADC.
[2]
[4]
4. The following diagram shows a circle with centre O .
The points A , B , C and D are on the circumference of the circle such that
AOC ˆ
2
� 114.5 and the area of the sector OABC is 14 cm .
(a) Find the length of OC .
(b)
Find the area of sector OADC.
[2]
[4]
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