volume_mute

Find the area of the following composite shape

publish date2020/11/16 01:06:00 GMT+11

volume_mute

Unit of measurement is cm2

complex-shape-10.jpg

2015.5
784
615.75
2000
1230

Correct Answer

2015.5

Explanation

  1. The area of the shape composite of a single square at one side and four half circles which all have the same area on the other side or if combined they will be two circles
    • Ashape = Asquare + 2 (Acircle)
  2. Write square area equation
    • Asquare = w2
  3. Write circle area equation
    • Acircle = πr2
  4. Calculate the area of the square where w = 28 cm
    • Asquare = 282 = 784 cm2
  5. Calculate the area of the circle where r = 14 cm (half diameter of 28 cm)
    • Atriangle = π * 142 = 615.75 cm2
  6. Calculate the area of the shape
    1. Ashape = 784 + 2 * 615.75 = 2015.5 cm2

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