Step-by-step explanation:
1) 180 - (90+32) = 180 - 122 = 58 (reason: angles in a triangle add up to 180°)
2) 180 - 144 = 36
36/2 = 18 (reason: angles in an isosceles triangle)
3) 180 - (26+26) = 180 - 52 = 128 (reason: angles in an isosceles triangle)
