The following three shapes are based only on squares, semicircles, and quarter circles. Find the perimeter and the area of each shaded part.

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What is the missing step in this proof ?

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?