The area of a circle is 49 pi m2 what is the radius?

So area is equal to pi(r)^2. Plug the number into A and solve for r

49(pi)=pi)(r)^2

Divide out the pi and you get r^2=49

Find the square root of 49 which would give you +- 7. It’s important to remember 7 is both positive and negative

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )