1) Acute angled triangle 
All the angles in a acute angled triangle are <90°. 
2) Right angled triangle 
One of the angles in a right angled triangle is 90° 
3) Obtuse angled triangle 
One of the angles in an obtuse angled triangle is >90° 
Answer: 
Sum of all the angles in a triangle is 180°. 59° + 85° + x = 180° 144° + x = 180° x = 36° 
Answer: 
3x + 4x – 8 + 3x – 2 = 180 10x – 10 = 180 10x = 190 x = 19° 
Second angle 
= 4x – 8
= 4(19) – 8
= 76 – 8
= 68°

Third angle 
= 3x – 2
= 3(19) – 2
= 57 – 2
= 55°
