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NCERT 5th Class (CBSE) Mathematics: Lines And Angle

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Lines -(a)

 

Lines -1

Lines -2

Lines -4

A protractor is used to measure angles.

Protractoris used to measure angles

This angle is measured on the inner scale as the baseline arm point  to 0° on the inner scale. The other arm crosses 50° showing that ∠ AOB = 50°.

This angle is measured on the inner scale

Angles are named according to their measures.

Angles are named according

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