Vocabulary
Name a shape that has no edges.
circle Aparallelogram
Circle
What is the circumference of a circle if:
the radius = 7 yds?
Use: C=2 . 3.14 . r
43.96 or 14π yds
What is the formula to find the area of a circle?
A= 3.14 . r . r
C= 2. 3.14 . r
A= 3.14 . r . r
What is the area of a circle if:
the Radius = 6 in
36π or 113.04 in2
What is the value of Pi?
3.14 4.13
3.14
Name the line in a circle that cuts it in half.
Radius Diameter
Diameter
What is the circumference of a circle if:
the radius = 9 yds?
Use: C=2 . 3.14 . r
56.52 or 18π yds
What is the formula to find the circumference of a circle?
A= 3.14 . r . r
c= 2 . 3.14 . r
C=2 . 3.14 . r
What is the area of a circle if:
the Radius = 3 ft
9π or 28.26 ft2
If you are dividing something by 2, you are cutting it in
half quarters
half
What do you call the half of the diameter?
Radius Circumference
Radius
What is the circumference of a circle if:
the radius = 8.4 yds?
Use: C=2 . 3.14 . r
52.75 or 16.8π yds
Find the are of a circle when the radius is 11 in.
C= 2 . 3.14 . r
69.12 inches
What is the area of a circle if:
the Diameter = 12 feet?
36π or 113.04 ft2
4 + x = 24
x = 20
The outside measurement of a circle. Or the distance around the outside of the circle
Area Circumference
Circumference
What is the circumference of a circle if:
the radius = 7.4 yds?
Use: C=2 . 3.14 . r
46.47 or 14.8π yds
What is the Area of a circle if:
the Diameter = 14 in
A= 3.14 . r . r
153.86 or 49π in2
What is the area of a circle if:
the diameter = 8 in
16π or 50.24 in2
Divide 48 by 4
48 / 4 = 12
The measurement of the inside of a circle. Or how much the circle covers
Circumference Area
Area
The circular fountain in front of the courthouse has a radius of 9.4 feet. What is the circumference of the fountain?
Use: C=2 . 3.14 . r
What is 59 ft?
Remember: a radius is HALF of the diameter.
16 / 2 = 8
Radius = 8
What is the area of a circle if:
the diameter = 9 yd
20.25π or 63.56 yd2
50 / 5 = 10