The congruent sides of an isosceles triangle are 4 cm each. If the perimeter is 14 cm, then the 3rd side is .

6 cm

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8 cm

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10 cm

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Solution

The correct option is A 6 cm
Given,
Perimeter of the triangle = 14 cm

Let the triangle be ABC
Now,
AB = AC [ Isosceles triangle]
$∴$ $T h e p e r i m e t e r o f t h e t r i a n g l e = 14 c m$
$A B + B C + A C = 14 c m$
$4 c m + B C + 4 c m = 14 c m$
$B C = 14 c m - 8 c m$
$B C = 6 c m$

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