B) Ten identical mementos are made by a school to awarding
10 students for first prize winners in games. If each memento
is made as shown in figure (shaded portion) in base PQRS is nu
silver plated from the front side at the rate of Rs. 20 per
sq.cm. Find the total cost of the silver plating of 10 memen-
tos. (OB=5cm, RQ =6cm, PS = 8 cm).
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Rs 10380 is total cost of the silver plating of 10 mementos
Step-by-step explanation:
Right angle triangle have sides
8 + 5 = 13 cm & 6 + 5 = 11 cm
Area = (1/2) * 13 * 11
= 71.5 cm²
Area of Arc segment = (90/360) π 5²
= 19.6 cm²
Area of front side to be silver plated = 71.5 - 19.6
= 51.9 cm²
Cost of Silver plating = Rs 20 per cm²
Cost of 1 = 51.9 * 20 = 1038 Rs
Cost for 10 = 10 * 1038 = 10380 Rs
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