Question
The area of a triangle is 216 cm² and the ratio of its
sides is 9: 12: 15. What is the perimeter of the triangle?Solution
Given ratio of sides, form a triplet of a right-angle triangle.  =1/2 × 9x × 12x = 21 54x2 =216  x² = 4  x = 2 Perimeter = (9 + 12 + 15) × 2 = 72 cm.
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