If arc length is (20) cm and sector area is (150) square cm, what is the radius?
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Answer and explanation
Correct answer: (15) cm
Sector area is ( \frac{1}{2}rs ), so (150=\frac{1}{2}\times r\times20) gives (r=15). When arc length is given, ( \frac{1}{2}rs ) is useful.
Frequently asked questions
What is the correct answer to this question?
(15) cm
Why is this the correct answer?
Sector area is ( \frac{1}{2}rs ), so (150=\frac{1}{2}\times r\times20) gives (r=15). When arc length is given, ( \frac{1}{2}rs ) is useful.
Which subject and chapter does this question cover?
This is a Class 12 Mathematics question. Chapter: Trigonometric Functions. Topic: Angles.
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