1. If a triangle has angles 135°, 15°, 30°. Is it an obtuse triangle?

yes no

2. If a triangle has angles 115°, 25°, 40°. Is it an acute triangle?

yes no

3. If a triangle has angles 90°, 60°, 30°. Is it a right angle triangle?

yes no

4. What is the third angle for the triangle, where first angle=55° and second angle=45°?

60° 80° 50°

5. If a triangle has 2 sides with equal lengths and 75° angle between them. What is the type of triangle?

Right Angle traingle Isosceles Equilateral

6. If a triangle has sides of 2cm, 3cm, 4cm, what is the type of triangle?

Scalene Equilateral Isosceles

7. If a triangle has 2 sides with equal lengths and 60° angle between them. What is the type of triangle?

Isosceles Equilateral Both

8. The perimeter of an equilateral triangle is 15cm. What is the length of one side?

45cm 15cm 5cm