Geometry
# Properties of Circles

$d_1=24$ and $d_2=18.$ What is the perimeter of the green colored region?

In the above diagram,$O,$ $\angle ABC = 115 ^ \circ$. What is angle $AOC$ (as marked) equal to?

In the above image of a circle with center at$14.$ If the two curves in the square are each one quarter of a circle with radius $14,$ calculate the area of the region bounded by the two curves in the above diagram.

The length of each side in the above square is$O_1$ and $O_2$ be the centers of two circles with the same radius $15\text{ cm}.$ What is the perimeter of the green colored region?

Let