B. Solve the word problem. 1. A closed cone model made of a tin has a radius of 4 cm and a slant height of 8 cm. Find the amount of material used in making the cone. 2. Find the surface area of a plastic ball of radius is 18cm.

Answer:
1. 150.72 cm^2
2. 4,069.44 cm^2
Step-by-step explanation:
kindly check if we used the same formula in module.
Goodluck!