Find the area of a sector with measure of arc equal to 90 degrees and radius equal to 1 foot?

Answer 1

First answer is right for wrong reason. If r not = 1 that formula doesn't work.
Area of circle = pi*r^2
Area of quarter circle = pi*r^2/4 = 0.785 ft^2
When r=2, area is 4 times as large, 3.14.
pi*r^2/4 = 3.14
First answer's pi*r/4 = 1.57

Answer 2

Arc 90 degree means area of quarter circle of 1 foot radius
Area of quarter circle = (Pi x D) / 4
= (Pi x 2r) / 4
=Pi/2 x r/2
=3.14/2 x1/2
=1.57 x .5
=0.785 Sq.foot