Triangles are used to make bridges because a triangle is an undeform able shape, as considered in the civil engineering field. It can hold the most force when applied to it, compared to quadrilaterals and arches. Isosceles triangles were used to construct a bridge in which the base (unequal side) of an isosceles triangle is 4m and its perimeter is 20m.
a) What is the length of equal sides?
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Let a, a and b be the sides of the triangle.
Perimeter = 3s
20 = 2a + 4
20-4 = 2a
a = 16/2 = 8m
Perimeter = 3s
20 = 2a + 4
20-4 = 2a
a = 16/2 = 8m
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