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Construction of Triangles When All Three Sides Are Given

in the diagra...

Question

in the diagram the dotted line and the black path form 7 equilateral triangle. The length of dotted line is 20cm What is the length of the black path in cm

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Solution

The length of black path is 40cm.
Because sum of all one side of triangle is 20.
So the sum of remaining 2 sides is 2x20=40cm

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