Step 1: Examine the given figure and make a note of the given angles.

Step 2: Based on the given data classify the triangles.

NOTE: If they given lengths, then find the types of triangles based on lengths.

If they given angles, then find the types of triangles based on lengths.

Step 3: Conclude that the given triangle is a right angle triangle. if you find 90 degrees in the given angles. (Otherwise go for the next step.)

EXAMPLE: Angles 45 \degree, 45 \degree, and 90 \degree \degree

Here we have 90 \degree. so it an right angle triangle.

Step 4. Conclude that it is an acute angled triangle. If all the angle are less that the 90 \degree. (Otherwise go for the next step.)

EXAMPLE: Angles 72 \degree, 73 \degree and 35 \degree

Here, All angles are less than 90 \degree

Step 5: Conclude that the given triangle is Obtuse angle triangle. If you find any one of the angle is greater than 90 \degree.

EXAMPLE: Angles 136 \degree, 20 \degree and 24 \degree

Here One angle is greater than 90 \degree.