Answer:
Step-by-step explanation:
7) The side opposite to the biggest angle is the longest.
75° > 56° > 49°
⇒ a > c > b
8) The angle opposite to the longest side is the biggest
8 > 7 > 6
⇒ b >a > c
9) 71 + x - 1 + 4x - 15 = 180 {Angle sum property of triangle}
71 - 1 - 15 + x + 4x = 180
55 + 5x = 180
5x = 180 - 55
5x = 125
x = 125/5
x = 25
x -1 = 25 - 1 = 24°
4x - 15 = 4*25 - 15 = 100 - 15 = 85°
85° > 71° > 24°
⇒ a > c > b
