Circle Day

The distance across a circle through its center is called the _____.

• diameter

• radius

• π

• center

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

Which segment is a radius?

• LM

• DC

• BD

• ML

what is the formula for finding diameter

• r = 2 d

• d = 2 r

• a = m c²

• c = π 2 r

what is the formula for finding radius

• c = π d

• c = 2 π r

• d = r/2

• r = d/2

find the diameter of the circle

• 14 m

• 7 m

• 14

• 3.5 m

find the diameter of the circle

• 1 ft

• 4 ft

• 4 mm

• 2 ft

which segment above represents the radius

• AC

• AB

• LM

In the diagram, m\angle ACB=45\degree and BC = 7 inches. What is the area of sector ACB, rounded to the nearest tenth?

• 19.2 square inches

• 45.0 square inches

• 153.9 square inches

• 315.0 square inches

• 5.5 square inches

• 4.19 cm

• 8.37 cm

• 12.56 cm

• 25.12 cm

• 33.49 cm