What is a round shaped figure that has no corners or edges?
Circle
When given the radius, how to do you find diamter?
Multiply by 2
The circumference is considered the ______of a circle.
Perimeter
The area is the number of square units ________ a circle.
The circumference of a circle is 4ℼ cm. Find its diameter, in centimeters.
d=4cm
What is the number of square units inside of a circle?
Area
When given the diameter, how do you find the radius?
Divide by 2
What are the two formulas for circumference?
C=ℼd
and
C=2ℼr
What is the formula for the area of a circle?
A=ℼr2
The circumference of a circle is 24ℼ cm. Find its radius, in centimeters.
r=12cm
What is the distance around the circle and considered the perimeter of a circle?
Circumference
If the radius is 7, what is the diameter?
14
The diameter of a circle is 54in. What is the circumference? Express your answer in terms of ℼ.
C=54ℼ in
The radius of a circle is 9 in. Find its area in terms of ℼ.
A=81ℼ in2
The circumference of a circle is 9ℼ m. What is the diameter, in meter?
d=9
What is the line segment that goes from the center to any point on the circle?
Radius
If the diameter is 32, what is the radius?
16
The radius of a circle is 12yd. What is the circumference rounded to the nearest tenth?
C=75.4yd
The diameter of a circle is 21 cm. Find its area to the nearest tenth.
A=346.4 cm2
If the radius of a circle is 32in. What is the circumference and area of the circle? Round each answer to the nearest tenth.
C=201.1in
and
A=3217.0in2
What is the line that runs across the entire circle passing through the center?
Diameter
If the diameter is 17.8, what is the radius?
8.9
Alison used wire fencing to form a border around a circular region in her backyard. If the radius of the circular region was 25 yards, what was the total length of the border, rounded to the nearest tenth of a yard?
C=157.1yards
Joseph created a circular play area for his daughter. The diameter of the circular region was 34 yards. If he wants to fill the play area with sand, about how much square yards of sand will he need? Round to the nearest hundredth of a yard.
A=907.92 yd2 of sand
DOUBLE JEOPARDY!
If the circumference of a circle is 32ℼ. What is the area of the circle? Round the answer to the nearest tenth.
A=804.2 m2