Question

What is the area if a sector with radius 10" and measure of arc equal to 45°?

Answer 1

The answer to this question would be B.12.5 (pi) sq in

Answer 2

We know that
[area of a circle]=pi*r²
r=10 in
[area of a circle]=pi*10²-----> 100*pi in²

if  360° (full circle) has an area of------------------> 100*pi in²
 45°-------------------------------> X
X=45*100*pi/360-----> x=12.5*pi in²

the answer is
the option B) 12.5*pi in²