Pls soon, i only have one try on this.

Use the radius you found in part i (r=26.8 cm) with the surface area formula below to find the surface area of the sphere. show your work and round your answer to the nearest tenth. the surface area of a sphere: sa = 4πr^2 self note: 3.8.4

Find the cosine function that is represented in the graph.

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0