Subject:
CBSE BOARD XAuthor:
lisa65Created:
1 year agoGiven:
Hemisphere with radius r = 3 cm
A rectangular sheet of length = 7 cm and breadth = 9 cm.
To Find:
the surface area of the combined figure.
Solution:
The Total surface area will be =
( The area of sheet + curved surface area of the hemisphere - area covered by hemisphere on sheet )
Area of rectangular sheet = l × b = 7 × 9 = 63 cm²
CSA of hemisphere = 2πr² = 2 × 22/7 × (3)² = 18π cm²
Area covered by hemisphere on sheet = πr² = π(3)² = 9π cm²
The Total surface area will be = (63 + 18π - 9π )
( 63 + 9π)
= 63 + 28.27
= 91.27 cm²
Hence, the surface area of the combined figure is 91.27 cm².
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