Question

1) The perimeter of an isosceles triangle is 131/20 cm. If one of its equal sides is 7/5 cm , find the third side ​

Answer 1

Answer:

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Step-by-step explanation:

so here third side is nothing but base

so we know if one side of isoceles triangle is equal other is also of same length of same measure as two sides except it's base are equal of isoceles triangle

so then we know that perimeter of isoceles triangle =2×confmgruent side+base

so substitute given values

ie

131/20=(2×7)/5+base

131/20=14/5+base

multiply (14/5) by 4

we get

131/20=56/20+base

solve it we get base=85/20

ie base=3.75 cm

hence length of third side is 3.75 cm