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May 10th, 2019, 09:15 AM   #1
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Circle Trigonometry

The area of a circle is 15 cm^2 and the length of its arc is 3 cm. Calculate the radius of the sector and its angle.

May somebody help please
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May 10th, 2019, 10:04 AM   #2
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If the radius of the circle is $r$ cm, $\pi r^2 = 15$, so $r = \sqrt{15/\pi}$.

The radius of the sector is also $r$ cm.

The angle of the sector (in radians) is $3/r$.
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May 10th, 2019, 11:31 AM   #3
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