I'm not sure what you are looking for. If you want to know the total number of degrees that interior angles of triangles total, they add up to 180°.
Hope this helps! :)
87.2 - 25.9 = 87.2 - 26 = 61.2 + 0.1 = 61.3
Answer
r = -20
Step-by-step explanation
4r-8=5r+12
subtract 4r from both sides of the equation
-8=r+12
subtract 12 from both sides of the equation
-20 = r
<span>A quadrilateral has congruent diagonals. It is probably a <u>Square</u></span>