Answer:
A. 81
B. 99
C. 129
Explanation:
(1) The sum of all the value of the angles in a triangle is 180.
So x + 51 + 48 = 180 <=> x = 81
(2) The value of the angle of the straight line is 180.
So x + y = 180 <=> 81 + y = 180 => y = 99
Same thing with (2)
51 + z = 180 => z = 129