Angle A + Angle B + Angle C = 180 degrees. 30+90+C=180 120+C=180 C=60 degrees.
90
The last angle would have to be 60 degrees as well. Since there are 180 degrees in a triangle, 60+60=120 and 180-120=60, it has to be 60 degrees.
an interior angle + and exterior = 180 Angle A: 180-30=150 Angle B: 180-60=120 Angle C: 180-90=90 Angle D: 180-120=60 SO WHATS THE ANSWER!!!?????
60 degrees. There are 180 degrees in a triangle.
Supplementary angle add to 180 degrees. So the supplement to a 60 deg angle is 180 - 60 = 120 degrees.
There are 180 degrees in a triangle 180 -80 -60 = 40 degrees Answer: 40 degrees
No, an equilateral triangle can't have a right angle, because an equilateral triangle has 3 equal angles of 60 degrees that add up to 180 degrees.
sum of all angles in a triangle is always 180. So 30 degrees, plus the right angle (90) = 120. 180-120 = 60
No, an equilateral triangle can't have a right angle, because an equilateral triangle has 3 equal angles of 60 degrees that add up to 180 degrees.
180 - 60 = 120 degrees.
the answer is 90 degreesA right angle measures 90 degrees. More than 90 degrees is an obtuse angle and less than 90 degrees is an acute angle.Any triangle with an angle that measures 90 degrees is known as a right triangle.