Four identical Memento is made by School to awarding 4 students for 4 values Honestly, punctuality,cleanliness and non violence. If each Memento is made as shown in the figure and its base PQRS is silver plated from the front side at the rate of rupees 20 per centimetre square.
(a) find the total cost of silver painting
(b) what values are depicted in the problem ?
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the total cost of silver painting = Rs 352.6
Step-by-step explanation:
Assuming Triangle POQ is Equilateral
OQ = OR + RQ = 7 + 3 = 10 cm
Area of Triangle POQ = (√3 / 4) 10² = 25√3 = 43.3 cm²
∠POQ = 60° ( equilateral Triangle)
Area of Sector ORS = (60/360) π * Radius²
= (1/6) (22/7) * 7²
= 25.67 cm²
Area of base PQRS = Area of Triangle POQ - Area of Sector ORS
= 43.3 - 25.67
= 17.63 cm²
Silver plating rate = Rs 20 per cm²
total cost of silver painting = 20 * 17.63 = Rs 352.6
the total cost of silver painting = Rs 352.6
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