How well do you know triangles?

1.What is third angle for the triangle if angle1 = 45° angle2 = 45°

45° 90° 0°

2.Triangle with any one side = 90°

obtuse acute right angled

3.Triangle has angles 125°, 15°, 30°. Is it an obtuse triangle?

yes no

4.Triangle has angles 60°, 60°, 60°. Is it an equilateral triangle?

yes no

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

15cm 45cm 5cm