In an isosceles triangle ABC, the base is 3 times smaller than the lateral side, and the perimeter is 21 cm. Find the sides of triangle ABC

univerkov | December 3, 2020 | education

let the sides be 3x cm, then the base-x cm. their sum (perimeter) = 21 cm. let’s make the equation:
x + 3x + 3x = 21
7x = 21
x = 21/7
x = 3cm is the base
3 * 3 = 9 cm are the sides
answer: 9 cm, 9 cm, 3 cm

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