# The perimeter of an isosceles triangle is 190mm, and its base is 20mm long. Find the length of the side.

December 28, 2020 | education

| 1) We find out the length of two equal sides if it is known that the perimeter of the triangle is 190 mm, and its base is 20 mm.

190 – 20 = 170 mm.

2) Let’s find out how long each of the two equal sides of the triangle has, if it is known that their joint length is 170 mm.

170/2 = 85 mm.

Answer: the sides of an isosceles triangle are 85 mm.

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