The three angles in an equilateral triangle are equal and they add up to \(180^\circ\). To find the size of each of these angles divide 180 by 3.

Then angles 𝑎, 𝑏 and 𝑐 must equal 180 as well. This proves that the angles of a triangle must add up to 180 degrees. Add the known angles. Form an equation equal to 360˚. Subtract the ...

If the triangles are congruent and each geometric figure has interior angles of equal measure, you can write the following pairs: In geometry, the following congruent angles theorems dictates the ...