cylinder problem 2:
A cylinder has a diameter of 20 cm and an height of 15 cm.
a) calculate the surface area
b) calculate the volume
answer:
a) answer surface area:
r = 20 : 2 = 10 cm
A = 2 * r * π * (r + h)
A = 2 * 10 * π * (10 + 15)
A = 1 570.8 cm²
A: The surface area is 1 570.8 cm².
b) answer volume:
V = r² * π * h
V = 10² * π * 15 (π = 3.1415..)
V = 4 712.39 cm³
A: The volume is 4 712.39 cm³.