Solve this triangle round to the nearest tenth where necessary

Three cylinders have a height of 8 cm. cylinder 1 has a radius of 1 cm. cylinder 2 has a radius of 2 cm. cylinder 3 has a radius of 3 cm. find the volume of each cylinder ( ! : ”0 )

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

Find the cosine function that is represented in the graph.