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There are many relationships: possibly the simplest one is the Sine rule.

If, in triangle ABC, sides AB, BC and CA are denoted, respectively, by c, a and b [ie each side is denoted by the lower case letter of the upper case letter representing the angle opposite] then

sin(A)/a = sin(B)/b = sin(C)/c

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Q: The relationship between sides and angles of a triangle?
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if any two angles are similar the triangle will be similar


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In equilateral triangle : sides are equal and angles are equal. So if all sides sre equal then the angles between them would be equal. The angles would equal 60 degrees. In an isosceles triagle, two of the three sides are equal. In a scalene triangle, all of the sides are different.


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