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 May 10th, 2019, 09:15 AM #1 Newbie   Joined: Apr 2019 From: Malawi Posts: 19 Thanks: 0 Math Focus: Trigonometry and calculus 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
 May 10th, 2019, 10:04 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,921 Thanks: 2203 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 $3/r$.
 May 10th, 2019, 11:31 AM #3 Newbie   Joined: Apr 2019 From: Malawi Posts: 19 Thanks: 0 Math Focus: Trigonometry and calculus Thank you

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