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In an isoceles triangle, the difference between one of the equal sides and the unequal side (longest of the three) is `3//10` of the sum of the equal sides. If the perimeter of the triangle is 90 cm, then find the length of unequal side in centimetresA. 40B. 80C. 25D. 50 |
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Answer» Correct Answer - a Let the equal side of the triangle be x cm Given perimeter of the triangle = 90 cm, then the unequal side `= 90 -2x`. Given that `(90 -2x) - x = (3)/(10) (2x)` `90 - 3x = (3x)/(5)` `90 = (3x)/(5) + 3x` `90 = (18x)/(5)` `:. X = 25 cm` `:.` Length of the unequal side `= 90 -2x = 90 -50 = 40 cm` Hence, the correct option is (a) |
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