GCSE Maths Foundation Level

Angles In A Triangle

Are there always exactly 3 angles in a triangle?
Yes, every triangle has exactly three sides and exactly 3 angles inside the triangle.

Is there anything special about the angles in a triangle?
Yes.
THE ANGLES IN A TRIANGLE ADD UP TO 180 DEGREES.

Can we do a possible question using the fact that the 3 angles in a triangle add up to 180 degrees?
Yes, you may be given the size of two of the angles inside a triangle and asked to find the size of the third angle.

STEP 1 ---- ADD the 2 known angles together
30 + 70 = 100
STEP 2 ---- SUBTRACT the answer to STEP 1 from 180
180 - 100 = 80
Answer........ Angle A = 80 degrees ........ Angle A = 80°

SAMPLE QUESTION