Circumference of Circles
Area of Circles
Composite Area
Area of Composite Figures
Vocabulary
100
Find the circumference of the circle below. Answer in terms of pi. 
6π cm
100
What is the formula to find the area of a circle?
A = π r2
100
Find the area of a rectangle.
Area = 60 in2
100
Draw an example of a composite shape. Include a triangle, rectangle, and semicircle
Drawing must include all 3 shapes
100
The radius of a circle is always ______ the diameter
Half
Diameter goes across the entire circle, the radius only goes across half
200
Find the circumference of a circle with a diameter of 7 miles.
Use 3.14 as pi.
21.98 miles
200
Find the area of a circle with a radius of 12cm.
Solve in terms of pi.
144π cm2
144 pi cm2
200
Find the area of a shape
A = 26 m2
200
A composite shape has an area of 500 ft2. The shape is composed of a circle and a triangle and the area of the triangle is 350 feet2. What is the area of the circle?
Area = 150 ft2
200
What is the formula for the area of a rectangle?
A = bh
Area equals base times height
300
Find the circumference of the circle below. Use 3.14 for π.
81.64 in
Circumference is pi times diameter
300
Find the area of a circle with a radius of 5 inches.
Use 3.14 as pi.
A = 78.5 inches2
300
What is the area of a triangle? The units are in meters
A = 60m2
300
Find the area of the composite figure. 
A = 216 cm2
Rectangle: 168 cm
Triangle: 96/2 = 48 cm
300
What are the two formulas for the circumference of a circle?
C = pi times diameter
and
C = 2 pi times radius
400
Find the circumference of a circle with a radius 2.5 yards.
Use 3.14 as pi.
15.7 yards
400
Find the area of a circle with a radius of 16 mm.
Use 3.14 as pi.
Also solve in terms of pi.
803.84 mm2
256 pi mm2
400
What is the area of a triangle with a height of 7 inches and a base of 14 inches?
A = 49 in2
Formula Area of a triangle = BH/2 <-- Base times Height divided by 2
400
Find the area of the composite figure.
A = 42 cm2
400
What are the diameters are the following circles?
Radius = 19.5 inches
Radius = 14.25 miles
Diameter = 39 inches
Diameter = 28.5 miles
If the radius is half the diameter, we just multiple it by 2 in order to find the diameter
500
Find the circumference of a circle with a diameter of 1.5 mm.
Use 3.14 as pi.
4.71 mm
500
Find the area of the semi-circle below with a radius of 3 cm.
Use 3.14 for pi.
Use area for a circle, then divide by 2 because it's a semicircle
A = 14.13 cm2
500
What is the area of a semicircle with the diameter of 15 meters? Round your answer to the nearest 100ths place (two decimal points)
Use 3.14 for pi
A = 88.31 m2
500
Find the area of the figure below.
Area = 521 mm2
Trapezoid: 364 mm
Semi-circle: 314/2 = 157 mm
500
If you found the circumference of a circle in terms of pi to be 28 pi cm, what would be the area?
Solve in terms of pi
A = 196 pi cm2
615.44 cm2
If the circumference is 28 pi, then the diameter is 28 cm. Which makes the radius 14 cm.