If a triangle has angles whose measures are 55 degrees and 80 degrees, what is the measure of the third angle?
The sum of the interior angles of a triangle = 180°
Let x be the unknown angle...so we have...
55 + 80 + x = 180
135 + x = 180 subtract 135 from both sides
x = 45°
Thank you!!
Glad to help....where I can....
+27 
