Find the area of the region enclosed between circles of radius 4 cm and 3 cm
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Answer:
Step-by-step explanation:
Solution :
Let R, r are radii of two concentric
circles .
R = 4 cm , r = 3 cm
Area of the ring ( A )
= π( R² - r² )
= π( R + r )( R - r )
= ( 22/7 )( 4 + 3 )( 4 - 3 )
= ( 22/7 ) × 7 × 1
= 22 cm²
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