Vocabulary
Center
What is the midpoint of a circle?
How do you find the radius if given a diameter?
What is divide the diameter by 2?
How do you find the diameter if given a radius?
What is multiply the radius by 2?
What is the formula for circumference?
What is C=Pi x D?
What is 3.14?
A line segment that goes from the center of a circle to one edge of the circle.
What is a radius?
A circle with a diameter of 10 cm.
What is 5 cm?
A circle with a radius of 10 in.
What is 20 inches?
What is the formula for area of a circle?
What is A=Pi x r x r ?
Which part of the circle is 3.14 times larger - circumference or diameter?
What is circumference?
Circumference
What is the distance around a circle?
A circle with a diameter of 8 yds.
What is 4 yds?
A circle with a radius of 8 ft.
What is 16 ft.?
What is the circumference of a circle with a diameter of 3 yds?
What is 9.42 yds?
C=Pi x d
C= 3.14 x 3
C = 9.42 yds
True or False: Pi is a proportional relationship between circumference and diameter.
True. Circumference is always 3.14 times larger than the diameter.
The distance from one side of a circle to the other that passes through the center.
What is diameter?
A circle with a diameter of 12 cm.
What is 6 cm?
A circle with a radius of 50 yds.
What is 100 yds. ?
What is the circumference of a circle with a radius of 2 cm?
What is 12.56 cm?
C = Pi x d
C = 3.14 x 4
C = 12.56 cm
What units are squared in an answer - circumference or area?
What is area?
A measurment of the space inside a circle.
What is area?
A circle with a diameter of 5 inches
What is 2.5 inches?
A circle with a radius of 2.5 inches.
What is 5 inches?
What is the area of a circle with a radius of 5 m?
What is 78.5 meters squared?
A = Pi x r x r
A = 3.14 x 5 x 5
A = 78.5 meters squared
What is the constant of proportionality in the formula for circumference: C=Pi x d
What is Pi?