4. Find the area of the
shaded region.

Diameter of the circle in the middle = 8 ft

Radius of the circle in the middle :

Thus, the radius of the circle in the middle = 4 ft

Area of the entire circle :

Thus, the area of the entire circle = 314 ft

Area of the circle in the middle :

Thus, the area of the circle in the middle = 50.24 ft

Area of the shaded portion :

= Total area of the figure - Area of the circle in middle

▪︎Therefore, the area of the shaded portion = 263.76 ft

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.