What is the altitude of this cylinder: B ==> C?

Question

A. line BC
B. segment BC
C. ray BC
D. Point BC
MY ANSWER: A. Line BC

What is the total surface area of this cylinder?

Radius = 8 cm
Height = 16 cm

A. 128 pi cm^2
B. 256 pi cm^2
C. 384 pi cm^2
D. 1024 pi cm^2
MY ANSWER: C. 384 pi cm^2

What is the best approximation of the total surface area of this cylinder?

Radius = 22 cm
Width? = 9 cm

A. 1380 cm^2
B. 4280 cm^2
C. 2140 cm^2
D. 1070 cm^2
MY ANSWER: D. 1070 cm^2

cylindrical container's lateral surface is to be covered by a label. The container's diameter is 5 inches and its height is 8 inches. How much paper is needed to create the label?

A. about 39.3 in^2
B. about 82.5 in^2
C. about 126 in^2
D. about 165 in^2
In the surface area formula for a cylinder with radius r and height h, what is the lateral area?
A. 2 (pi) r^2
B. pi rh
C. 2 (pi) rh
D. r^2
MY ANSWER: A. 2 (pi) r^2

Thank you Ms. Sue for helping me!

Answer 1

1. I don't know.

2. A=2πrh+2πr^2
A = (2 * 3.14 * 8 * 16) + (2 * 3.14 * 64)
A = 803.84 + 401.92

Please post the last two questions as a New Question.

Answer 2

#3 using #2, (B)
#4 A=πdh=125.6 so, (C)
#5 lateral area is circumference * height = 2πrh