the frustum shaped outer portion of the table lamp has to be painted including the top part. find the total cost of painting the lamp if the cost of painting 1 sq.cm is ₹2
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total cost of painting the frustum shaped outer portion of the table lamp = Rs 1357.7 if cost of painting 1 sq.cm is ₹2
Step-by-step explanation:
Picture is attached:
Curved Surface Area = π (12 + 6) * slant height
Slant height = √(12 - 6)² + 8² = 10 cm
Curved Surface Area = 18 π * 10
= 180π cm²
Top Surface area = π * 6² = 36π cm²
Total Area to be pained = 180π + 36π
= 216π
using π = 22/7
= 216 * 22/7
= 678.86 cm²
cost of painting 1 cm² is ₹2
=> Cost of Painting = 678.86 * 2
= 1,357.72 Rs
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