Introduction:

Finding the third angle of a triangle is like solving a puzzle. You have two angles, and you need to figure out the third one. It's all about understanding how angles work in triangles.

Simple Explanation:

What is the Third Angle of a Triangle?

Every triangle has three angles, and they always add up to 180 degrees.

So, if you know two of the angles, you can find the third one by subtracting the sum of the two known angles from 180 degrees.

Example:

Using the 180-Degree Rule:

Let's say you have a triangle with two angles: one is 60 degrees, and the other is 45 degrees.

To find the third angle, subtract the sum of the two known angles from 180 degrees.

So, 180 degrees - (60 degrees + 45 degrees) = 180 degrees - 105 degrees = 75 degrees.

The third angle is 75 degrees.

Checking the Rule:

You can always check if you did it right by adding all three angles together. They should equal 180 degrees.

Key Points to Remember:

A triangle always has three angles.

The angles in a triangle add up to 180 degrees.

To find the third angle, subtract the sum of the known angles from 180 degrees.

Activity:

Draw different triangles on paper or use objects like straws to create triangles.

Measure two angles, and let your child find the third angle using the 180-degree rule.

Challenge them with different triangles to practice.

Extra Tip:

Make it a fun challenge by creating triangle puzzles for your child to solve!