Question

Study a corner of your classroom where two walls and the ceiling meet. How many right angles can you see at the corner?

Short answer

There are three right angles at the corner.

Step-by-step solution

Step 1. Draw a diagram representing walls and ceiling.

Step 2. Apply the definition of right angle.

When two lines are perpendicular to each other, at intersection they form an angle which measures exactly 90 degree is called right angle.

Step 3. Description of step.

From the figure It can be observed that, there are total three right angles at a corner where two walls and ceiling meet, that is, first with two walls, second with first wall and ceiling and third with second wall and ceiling.

Therefore, there are 3 right angles at the corner.