Intro to Circles

The definition of radius is

• distance from one point to another point

• distance around the circle

• distance from the center to any point on the circle

• distance across the circle through the center

Tags

CCSS.HSG.C.A.2

The definition of diameter is

• distance from the center of any point on the circle

• distance across the circle through the center

• distance from one point to another

• distance around the circle

Tags

CCSS.HSG.C.A.2

What is the formula for finding diameter?

• r = 2 d

• d = 2 r

• a = m c²

• c = π 2 r

Tags

CCSS.7.G.B.4

Find the radius of the circle

• 20 ft

• 10 ft

• 5.5 ft

• 10 inches

Tags

CCSS.7.G.B.4

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

If you are given the diameter, how can you calculate the radius?

• Multiply the diameter by 2
• Divide the diameter by 2
• Add 2 to the diameter
• Subtract 2 from the diameter

Tags

CCSS.7.G.B.4

What is the exact circumference?

• 25.12 km

• 50.24 km

Tags

CCSS.7.G.B.4

What is the approximate circumference?

• 25.12 km

• 50.24 km

Tags

CCSS.7.G.B.4

What is the approximate numerical value of this sign?

• 3.11

• 3.14

• 4.13

• 6.28

Tags

CCSS.HSG.GMD.A.1