A ball is thrown upward at a velocity of 15 meters per second from a height that is 20 meters above the ground. The heighth (in meters) of the ball at timet (in seconds) after it is thrown can be found by the formula below.
h = -5t2 + 15t + 20
Find the time when the ball is again 20 meters above the ground.

A3cm×3cm\greend{3\,\text{cm} \times 3\,\text{cm}} 3cm×3cm start color greend, 3, space, c, m, times, 3, space, c, m, end color greend rectangle sits inside a circle with radius of 4cm\blued{4\,\text{cm}} 4cm start color blued, 4, space, c, m, end color blued . what is the area of the shaded region? round your final answer to the nearest hundredth.