Question

What is the area of this

Answer 1

For this, you can use the formula for the area of a circle. The formula is pi*radius*radius

Look at this figure as 1/4 of a circle. You can do this because the measure of the angle of the corner is 90 degrees, and 90 is 1/4 of 360.

Since the radius of the full circle would be 10, the area would be pi*10*10=100pi

Since this figure is 1/4 of that, the area is 25pi.

Hope this helps!