2021-09-21

Dare2solve | Three equilateral triangles

This question was uploaded on 20/09/21 on social media accounts.

Three equilateral triangles are placed such that two triangles having one common vertex with the third triangle. And both triangles having the base on a line passing through the vertex of the third triangle. Find the length of the common line.

Solution 1:

By using Ptolemy Theorem:
\[(a)(c)+(b)(c)=(x)(c)\]
\[\Rightarrow x = a+b\]


Solution 2:




Triangle having two blue lines and one line is orange and green line is an equilateral triangle:
Blue line = a + b




Puzzle related to Geometry, Triangle, Length.

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