The figure shows 2 concentric circles with diameter 30 cm and 20 cm . Find the area of the shaded region .
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Area of Shaded region = 125 π = 392.5 cm²
Step-by-step explanation:
2 concentric circles with diameter 30 cm and 20 cm
Radius of Larger Circle = 30/2 = 15 cm
Radius of Smaller Circle = 20/2 = 10 cm
Area of Larger Circle = π * 15² cm²
Area of Smaller Circle = π * 10² cm²
Area of Shaded region = π * 15² - π * 10²
= π ( 15² - 10²)
= π (15 + 10)(15 - 10)
= π * 25 * 5
= 125 π
using π = 3.14
= 392.5 cm²
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