Circumference of a Circle
Area of Circles
Area and Perimeter of a Semicircle
This column is Under Construction!!!
Area of a Composite Shape
100

What is the equation (s) for the circumference of a circle? 

C=2πr or C=πd

100

What is the equation for the area of a circle?

A = πr^2

100

What is the equation for the area of a semicircle?

A = (πr^2)/2

100

Describe the process needed to calculate the area of a composite figure. (Explain the 4 individual steps)

1. Identify and divide the composite figure into recognizable basic shapes (rectangles, triangles, circles, etc.). 

2. Use the appropriate formula or equation for each simple shape 

3. If the composite figure is made of multiple shapes, add their areas together. If a part of the shape is missing (such as a hole or cut-out), subtract the area of that part.

4. Ensure your final answer has the correct square units (e.g., cm², in², m²).  

200

Find the circumference of a circle with a diamter of 16.6yds. Use 3.14 for pi and round to the tenth place


52.1 yd

200

Find the area of the circle with a radius of 12cm. Use 3.14 for pi

452.16 cm2

200

What is the equation for the perimeter of a semicircle?

P = (πd)/2 + d

200

Find the area of the composite shape. 


189.25 in2

300

Find the circumference of a circle with a diameter of 8.4yds. Use 3.14 for pi and round to the tenth place

26.4 yd

300

Find the area of the circle with a radius of 6km. Use 3.14 for pi

approximately 113.0 km2

300

Find the area of the semicircle with a diameter of 8 in. Use 3.14 for pi

25.12 in2

300

Find the area of the composite shape. 


21.5cm2

400

Find the circumference of a circle where the radius is 9.5 in Round to the tenth.

59.7 in

400

Find the area of a circle with a diameter of 26.4km. Round to the tenth.

approximately 547.1km2

400

Find the perimeter of the semicircle with a diameter of 8 in. Use 3.14 for pi


20.56 in

400

Find the area and perimeter of the composite shape. 


Area = 53.12 ft² 

Perimeter = 30.56 ft 

500

Find the radius of the circle given the circumference of 62.8 mi

10 mi

500

Find the diameter of the circle given the area of 78.5 ft²

10 ft

500

If the area of a semicircle = 14.13 in2 what is the diameter?

6in

500

Find the area and perimeter of the composite shape. 


Area = 78 cm²

Perimeter = 44 cm

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