- The bases are circles
- Radius is half a diameter
- Diameter cuts a circle in half
- Circumference is the perimeter of a circle
- Pi is the ratio between circumference/diameter or 3.14

Formulas:

Circumference - pi (d) = c

Radius - d/2 = r

Diameter - 2r = d or c/pi

Area of a circle:

pi (r²) or pi (r) (r) **Net of a cylinder:**

Formula:

lxw = a

pi (r) (r) = a

d = 2r

r = d/2

c = pi(d)

Here are the answers on our homework.

*I'm only showing one of each (diameter, circumference, radius) because Mr. Harbeck told me to.*

Here is a link on cylinders.

**A video to help you learn the surface area of a cylinder:**

Cylinder Volume and Volume Problems

**7.3**

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