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

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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