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Side of cube = 5 cm
TSA of cube = 6(5)²= 6 × 25 = 150 cm²
Diameter of Hemisphere = 4.2 cm
Radius of Hemisphere = 2.1 cm
Total Surface Area of Solid :
TSA of Cube + CSA of Cube - Base Area of Hemisphere
= 150 + 2πr² - πr²
= 150 + πr²
= 150 + 22/7 × 21/10 × 21/10
= 150 + 22 × 3/10 × 21/10
= 150 + 13.86 = 163.86 cm²
= 164 cm ² (approx.)
Cost of painting for 100 cm² = 5
Cost of painting for 164 cm² :
= 164 × 5 / 100 = 820 / 100
= Rs 8.2.
TSA of cube = 6(5)²= 6 × 25 = 150 cm²
Diameter of Hemisphere = 4.2 cm
Radius of Hemisphere = 2.1 cm
Total Surface Area of Solid :
TSA of Cube + CSA of Cube - Base Area of Hemisphere
= 150 + 2πr² - πr²
= 150 + πr²
= 150 + 22/7 × 21/10 × 21/10
= 150 + 22 × 3/10 × 21/10
= 150 + 13.86 = 163.86 cm²
= 164 cm ² (approx.)
Cost of painting for 100 cm² = 5
Cost of painting for 164 cm² :
= 164 × 5 / 100 = 820 / 100
= Rs 8.2.
MrPujan:
thanks Gandhi ji
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