From the diagram above, which of the following is true?
- a +b + x =180
- a = b + x
- a – b = 180 - x
-
a + b = x + 180
- a – b = x - 180.
The correct answer is: D
Explanation
From the diagram, the angles in the triangle are:
(180 - a)°, (180 - b)° and x°.
\(\therefore\) (180 - a) + (180 - b) + x = 180°
360 + x - a - b = 180°
360 - 180 + x = a + b
180 + x = a + b.