The perimetre of an isosceles triangle is 40 cm.The base is two-third of the sum of equal sides.Find the area of triangle.
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let the equal sides be x
base = 2/3 ( x + x ) = 2/3 (2x) = 4x/3
ATQ
x + x + 4x/3 = 40
3x + 3x + 4x = 120
10x = 120
x = 12
the sides are -
12 cm
12 cm
16 cm
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