Finding Missing Angles in Right Triangles

This video tutorial explains the concept of right angles, which are 90° angles often represented by a small square symbol. It demonstrates how to find missing angles in a right angle by subtracting the given angle from 90°. The video also includes a typical exam question example, where the viewer learns to calculate the missing angle when given one angle in a right angle. The tutorial emphasizes that the sum of angles in a right angle is always 90° and provides strategies for solving problems involving right angles.

What symbol is commonly used to represent a right angle?

• A square box

• A triangle

• A star

• A circle

What is the measure of a right angle?

• 60°

• 45°

• 120°

• 90°

If one angle in a right angle is 60°, what is the measure of the other angle?

• 30°

• 60°

• 40°

• 50°

How do you find a missing angle in a right angle when one angle is given?

• Add the given angle to 90°

• Divide the given angle by 2

• Subtract the given angle from 90°

• Multiply the given angle by 2

In a right angle triangle, if angle A is 18°, what is the measure of angle B?

• 72°

• 62°

• 52°

• 82°

What is the first step in solving for a missing angle in a right angle problem?

• Add all angles together

• Subtract the known angle from 90°

• Multiply the known angle by 90°

• Divide the known angle by 90°

If you have three angles that sum to 90°, how do you find the missing angle?

• Divide the two given angles

• Subtract the two given angles from 180°

• Multiply the two given angles

• Add the two given angles and subtract from 90°

What should you do if you see a right angle symbol in a problem?

• Assume the angle is 45°

• Assume the angle is 60°

• Write 90° beside it

• Ignore it

In a right angle, if one angle is 45°, what is the measure of the other angle?

• 55°

• 35°

• 60°

• 45°

If two angles in a right angle are 30° and 60°, what is the measure of the third angle?

• None, as it already sums to 90°

• 0°

• 10°

• 90°