What is the surface area of a hemisphere with a radius of 23

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

Consider circle c with angle acb measuring 3/4 radians.if minor arc ab measures 9 inches, what is the length of the radius of circle c? if necessary, round your answer to the nearest inch.

What is the equation for the line that passes through the points (-6,4) and (-2,9) answer in point slope form