Measuring Angles with a Protractor

In this video, Teacher MJ explains how to measure angles in triangles using a protractor. The lesson includes two examples: one with a general triangle and another with an isosceles triangle. The video emphasizes the importance of ensuring the sum of interior angles equals 180 degrees and demonstrates the process of measuring each angle accurately. The session concludes with a recap and encouragement to share the video.

What is the main topic discussed in the video?

• Solving algebraic equations

• Measuring angles in a triangle using a protractor

• Calculating the area of a triangle

• Identifying types of triangles

What is the sum of the interior angles in a triangle?

• 90°

• 270°

• 180°

• 360°

Which tool is used to measure angles in the video?

• Ruler

• Calculator

• Protractor

• Compass

How many degrees is angle A in the first example?

• 30°

• 70°

• 90°

• 80°

What is the measure of angle C in the first example?

• 30°

• 80°

• 60°

• 70°

How is angle B calculated in the first example?

• By using a calculator

• By measuring directly

• By subtracting the sum of angles A and C from 180°

• By guessing

What is the measure of angle B in the first example?

• 90°

• 70°

• 100°

• 80°

What is the first step in measuring angle C in example two?

• Align the protractor's center with vertex B

• Align the protractor's center with vertex A

• Align the protractor's center with vertex C

• Align the protractor's center with the midpoint

What is the measure of angle C in example two?

• 60°

• 65°

• 57°

• 55°

How is angle A calculated in example two?

• By guessing

• By using a calculator

• By measuring directly

• By subtracting the sum of angles B and C from 180°