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beausisugpula
29.03.2020 •
Mathematics
A rectangular piece is cut from a circular sheet as shown on the diagram below. The length and width of the rectangle is 12 cm by 15 cm respectively. The circular part has a 20 cm radius. Find the remaining area of the sheet in cm2 cm 2 after the rectangle has been removed. Note : The figures are not drawn to scale
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Ответ:
The area of remaining sheet is 1077cm²
Step-by-step explanation:
First, you have to find the area of circle using the formula, A = πr², where r is the radius of circle:
r = 20cm
A = π × 20²
= 400π cm²
Second, you have to find the area of rectangle:
A = 12 × 15
= 180 cm²
Lastly, you need to substact the area of rectangle feom the area of circle to find the remaining sheet that has not being cut:
A = 400π - 180
= 1077 cm² (3s.f)
Ответ:
10
Step-by-step explanation: