Question
If the cost of painting is Rs 250 per km, then what is the cost for painting the boundary of an equilateral triangle shaped garden having its sides as 4 km also find the area of the garden if its height is 3.46 km [4 MARKS]
Answer: Option A
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Steps: 2 Marks
Formula: 1 Mark
Answer: 1 Mark
The perimeter of an equilateral triangle:
= 3 × length of a side.
The total distance to be painted:
= 3 × 4 = 12 km
⇒ Hence, the total cost for painting:
= 250 × 12
= Rs 3000
⇒ Area of the garden
= 12× base × height.
= 12×42×3.46
= 3.46 km2
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