From the diagram above, which of the following is true?
A.
a +b + x =180
B.
a = b + x
C.
a – b = 180 - x
D.
a + b = x + 180
E.
a – b = x - 180.
Correct answer is D
From the diagram, the angles in the triangle are:
(180 - a)°, (180 - b)° and x°.
∴∴ (180 - a) + (180 - b) + x = 180°
360 + x - a - b = 180°
360 - 180 + x = a + b
180 + x = a + b.