What has 2 dimensional shape and the perimeter is also known as a circumference

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4

Three cylinders have a volume of 2836 cm^3. cylinder a has a height of 900 cm. cylinder b has a height of 225 cm. cylinder c has a height of 100 cm. find the radius of each cylinder. use 3.14 as an approximate for π

What describes horizontal cross section of the right rectangle 6m 8m 5m