Question 28
Circle TheoremsFind the length of a chord which subtends an angle of 90° at the centre of a circle whose radius is 8cm.
- A.8√3 cm
- B.4 cm
- C.8 cm
- D.8√2 cm
Show the answer and explanation
Answer: D (8√2 cm)
Explanation
The two radii and the chord form a right-angled triangle, so chord = √(82 + 82) = 8√2 cm.