question 5:
- total angle of a right angle triangle is 180°
- minus 180° - 90° - 51° = 39°
- Since there is also staright line so 180° - 39°
answer : 141°
question 6:
(small triangle)
180° - 74° - 34° = 72° (the unknown angle)
(large triangle)
180° - 72° - 56° = 52° (x)
answer: 52°
