Formulas for circles

Whats pi?

• Pi is the circumference divided by the diameter

• Pi is the diameter divided by the circumference

• Pi is approximately 22 divided by 7

• I want pumpkin pie

Tags

CCSS.HSG.GMD.A.1

Whats the radius of a circle?

• Its the line that passes through the center point of a circle and goes to the other side.

• Its the line from any point of the circle to the center.

Whats the diameter of a circle?

• The diameter of a circle is half the length of the radius
• The diameter of a circle is a line going from one side of the circle to another and on the way touching the center point.

• The diameter of a circle is the same as the area

Tags

CCSS.HSG.C.A.2

What is the circumference of a circle?

• The circumference of a circle is the diameter of the circle

• The circumference of a circle is the area of the circle

• The circumference of a circle is basically the perimeter of the circle

• The circumference of a circle is the radius of the circle

Tags

CCSS.7.G.B.4

How to find the diameter of a circle?

• To find the diameter of a circle, divide the circumference by pi.
• To find the diameter of a circle, subtract the radius from the circumference.
• To find the diameter of a circle, add the radius and the circumference.
• To find the diameter of a circle, multiply the radius by 2.

Tags

CCSS.7.G.B.4

How to find the radius of a circle? (Division is mentioned as /)

• Radius = Diameter / 2

• Radius = Perimeter / 2
• Radius = Area / 2
• Radius = Circumference / 2

Tags

CCSS.7.G.B.4

How to find the circumference of a circle?

• Circumference = Diameter + Radius
• Circumference = π x Diameter
• Circumference = 3 x Diameter
• Circumference = 2 x Radius

Tags

CCSS.7.G.B.4