28. Two equal sides of a triangle are each 5 metres less than twice the third side. If the
perimeter of the triangle is 55 metres, find the lengths of its sides.
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Answer:13m,21 m,21m
Step-by-step explanation:
Given that two sides of a triangle are equal and these are 5m less than twice the 3rd side.
Let 3rd side length=x m
Then other two sides=(2x-5)m each
Now,
Perimeter of a triangle= sum of all sides
55=x+(2x-5)+(2x-5)
Or, 55=5x-10
Or,65=5x
Or,x=65/5=13m
Therefore third side=13m
And other two sides=2×13-5=21m
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