The area of a sector of a circle with a central angle of 9𝜋/14 rad is 21 m2. Find the radius of the circle. (Round your answer to one decim

A central angle 𝜃 in a circle of radius 4 m is subtended by an arc of length 5 m. Find the measure of 𝜃 in degrees. (Round your answer to one decimal place.)

Find the measure of 𝜃 in radians. (Round your answer to two decimal places.)
𝜃 =         rad

The area of a sector of a circle with a central angle of 9𝜋/14 rad is 21 m2. Find the radius of the circle. (Round your answer to one decimal place.)     

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$A=r^2\pi \cdot\frac{9\pi}{14\cdot 2\pi }\\ A=r^2\cdot\frac{9\pi}{28}\\ r=\sqrt{\frac{28A}{9\pi }}\\ r=\sqrt{\frac{28\cdot 21m^2}{9\pi }}$

$r=20.8\ m$

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