SaiBook.us Measurement

Example

Title: Angles

Grade: 4-a Lesson: S3-L2

Explanation: The best way to understand measurement is by looking at some examples. Take turns and read each example for easy understanding.

Examples:

Find the missing angle given in following image(20°,20°,40°,x).

$1$

Step 1a

The given angles are 20°,20°,40°,x

The missing angle is 'x'

The straight line angle is 180

So the sum of angles 180 = 20 + 20 + 40 + x

After adding 180 = 80 + x

So their fore x = 180 - 80 = 100

The missing angle x = 100

Explanation: Therefore,the missing angle in the given image is x=100°.