right angle acute obtuse How to measure angles using a protractor

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Presentation transcript:

right angle acute obtuse How to measure angles using a protractor degrees reflex

A 180 o Protractor Base line Cross hairs Two sets of numbers Outside numbers Inside numbers Base line Cross hairs (where the 2 lines cross) Two sets of numbers

angles, it is important to When measuring angles, it is important to know which numbers to use.

FIRST FIND THE BASE LINE PUT THE ‘CROSS HAIRS’ OF THE PROTRACTOR ONTO THE ANGLE AS ACCURATELY AS POSSIBLE. FIRST FIND THE BASE LINE THE OTHER LINE IS RESTING ON THE 40... BASE LINE THE BASE LINE IS RESTING ON THE ‘0’ OF THE INSIDE NUMBERS, SO USE THEM. So the angle is 40°

The angle is 70° LET’S TRY ANOTHER ONE USE THE INSIDE NUMBERS AGAIN. Base line The angle is 70°

INSIDE NUMBERS AGAIN The angle is 120°

The angle is 60° THE ANGLE IS FACING TO THE LEFT THIS TIME Line up the ‘cross hairs’ with the angle. The angle is 60° Make sure the base line of the protractor is over the base line of the angle. The base line is on the ‘0’ of the outside numbers this time, so use those ones.