Step: 1

A triangle in which one of the angles measures 90° is called a right triangle.

Step: 2

Among the angle measures, one is 90°.

Step: 3

So, a right triangle would be formed with the measures of angles.

Correct Answer is : right triangle

Step: 1

A right triangle has one 90° internal angle (a right angle).

Step: 2

One of the angles in all the figures measures 90° except in Figure 4.

Step: 3

Therefore, Figure 4 is not a right triangle.

Correct Answer is : Figure 4

Step: 1

A right triangle has one 90° internal angle (a right angle).

Step: 2

Among the choices, 90°, 75° and 15° can be the angles of a right triangle.

Correct Answer is : 90°, 75°, 15°

Step: 1

Figure 1 has an angle more than 90°. So, that appears to be an obtuse angle.

Step: 2

Figure 2 has an angle 90°. It is a right angle.

Step: 3

Figure 3 has an angle less than 90°. So, that appears to be an acute angle.

Step: 4

So, Figure 2 has an angle that appears to be a right angle.

Correct Answer is : Figure 2

Step: 1

A right triangle has one 90° internal angle (a right angle).

Step: 2

Among the choices, 90°, 35° and 55° can be the angles of a right triangle.

Correct Answer is : 90°, 35°, 55°

Step: 1

An angle which measures 90° is called a right angle.

Step: 2

A triangle which measures 90° is called a right angle triangle.

Step: 3

Amongst the figures, Figure 1 and 3 are right triangles and Figure 2 is not a right triangle.

Correct Answer is : Figure 2

- Points, Lines, Line Segments, Rays and Angles-Gr 4-Solved Examples
- Exploring Intersecting, Parallel and Perpendicular Lines-Gr 4-Solved Examples
- Classifying Angles-Gr 4-Solved Examples
- Two-dimensional Geometric Figures-Gr 4-Solved Examples
- Lines of Symmetry-Gr 4-Solved Examples

- Right Triangle