Answer:
43, 45, 36
Step-by-step explanation:
2a
43+x+x+51=180 [Sum of angles of a triagle]
2x=180-43-51
x=86/2
x=43
2b
x+90=135 [The measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles of the triangle]
x=45
2c
x+2x=108 [The measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles of the triangle]
3x=108
x=108/3
x=36
