Radius
If the diameter is 20cm, what is the RADIUS?
10
A radius circle is 5. What is its diameter?
10
Point in the middle of the circle
Center
A round pizza has a radius of 5 inches. What is the area of the pizza?
A=78.53in2
What is Circumference?
Distance AROUND
If the diameter is 100 cm, what is the radius
50 cm
The radius is 6 meters; what is its diameter
12 meters
The distance around the OUTSIDE of a circle is called...
Circumference
If the radius of a circular garden is 4 meters, what is the area of the garden?
A= 50.26m2
A circle has a radius of 3 cm. What is the circumference of the circle?
C= 18.84cm
What do we do to the diameter to find the radius?
Divide by 2
What do we do to the radius to find the diameter?
Multiply by 2
Half of the diameter
Radius
What is the formula to find the area?
A = (3.14) x r2
Formulas to find Circumference
C= 3.14d
C=2(3.14)(r)
If the diameter is 350, what is its radius
175
If the radius is 45 cm, what is the diameter
90 cm
What is the formula for area?
Denker will check your board
(3.14) x r2
The radius of a circular swimming pool is 2 feet. What is the area of the swimming pool?
A=12.56ft2
A round pizza has a radius of 5 inches. What is the circumference of the pizza?
C=31.41in
If the diameter is 80 inches, what is its radius
40 inches
If the radius is 30ft, what is the DIAMETER?
60 ft
A line that goes from one side of the circle to the other AND goes through the center
diameter
A circle has a radius of 7 cm. What is the area of the circle?
153.93cm2
A circular swimming pool has a radius of 7 feet. What is the circumference of the swimming pool?
C=43.98ft