Each side of an equilateral triangle is increased by 12 cm. The ratio of the perimeters of the new
triangle and the given triangle is 5:4. find perimeter of given triangle
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144cm let 1st each side if a equilateral triangle is x cm then perimetre is 3x cm. next perimetre is (3x+36) cm . according to question (3x+36):3x=5:4 .hence to solve this we find each side of the triangle is 48 cm. so the perimetre of the circle is (48×3)cm=144 cm
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