Classification of Triangles Based on Angles

Q.

What is a triangle in which each angle is less than 90 degrees called?

1. Right triangle

2. Scalene triangle

3. Obtuse triangle

4. Acute triangle

Q. If two angles of a triangle are ${30}^{\circ },{120}^{\circ }$, then the triangle will be

1. Right angle triangle
2. Scalene triangle
3. Equilateral triangle
4. Isosceles triangle

Q.

If an angle measures 180 degrees, what is it called?

1. Obtuse Angle

2. Straight Angle

3. Right Angle

4. Acute Angle

Q. In a right-angled triangle, one of the angles must be equal to __.

1. 180 degrees
2. 90 degrees
3. 120 degrees
4. 145 degrees

Q. A triangle has two angles measuring 53${}^{\circ }$ and one angle measuring 74${}^{\circ }$. What type of triangle is this?

1. Isosceles
2. Scalene
3. Right angled
4. Equilateral

Q.

Find the vertical angle of $\Delta ABC$.

1. 15°

2. 10°

3. 25°

4. 20°

Q.

The angles of a triangle can be ${36}^o,{45}^{o}and{99}^o$

1. False

2. True

Q. The triangle shown below is an isosceles right-angled triangle.

1. False
2. True

Q.

In a right angled triangle, the angles other than the right angle are _______ .

1. supplementary

2. acute angles

3. greater than right angles

4. obtuse angles

Q.

A triangle can have all the three angles greater than ${60}^{\circ }$.

1. True

2. False