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Let the third side be x metres, Then, Two equals sides are = 2x metres. Perimeter = 20m. Perimeter of a triangle = sum of all sides. Therefore, ⇒20=2x+2x+x ⇒20=5x ⇒x=4 Therefore, Sides of triangle are 4m,8m and 8m.

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Let the equal sides be = a cm the third side be = b cm

So we have a = 2 b

perimeter = 20 m a + a + b = 20 m 2b + 2b + b = 20 m 5 b = 20 m

=> b = 4 meters and hence, a = 8 meters

The three sides of the triangle are : 4 m, 8 m and 8 m