Plzzz someone help I'm stuck plz help radius is 2 1/2cm​

19.63cm²

Step-by-step explanation:

Area of circle - πr²

Radius = 2.5

π(2.5)² = 3.14 x 6.25 = 19.63 cm²

20

step-by-step explanation:

answer: the answer is (b) amie should have multiplied

step-by-step explanation: given a sphere and a cylinder with same radius and height.

let, 'r' be the radius of the cylinder and sphere and 'h' be the height of the cylinder. according to the question,

r = h.

now, the volume of the sphere will be

and the volume of the cylinder will be

therefore, we have

thus, ammie should have multiplied the volume of the sphere