Protractor Center Hole. Measuring and Drawing Angles with a Protractor By Christine Berg Edited By V Hamilton.

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Presentation transcript:

Measuring and Drawing Angles with a Protractor By Christine Berg Edited By V Hamilton

Protractor Center Hole

Protractor Straight Edge

Protractor Curved Edge

Place the center hole over the vertex of the angle Step 1: Place the center hole over the vertex of the angle

Line up (make parallel) the straight edge with one side of the angle Step 2: Line up (make parallel) the straight edge with one side of the angle

Step 3: Find the point where the second side of the angle intersects with the curved edge

Read the number on the protractor to find the measure of the angle Step 4: Read the number on the protractor to find the measure of the angle

Drawing Angles with a Protractor

Draw a ray with the straight edge of the protractor Step 1: Draw a ray with the straight edge of the protractor

Place the center hole over the starting point of the ray Step 2: Place the center hole over the starting point of the ray

Place a dot at the angle measure required Step 3: Place a dot at the angle measure required

Step 3: Line up the straight edge over the starting point of the ray and the dot

Step 4: Draw a ray connecting the two marks. The point at which they meet is called the vertex

Draw an angle which measures 120o Try this: Draw an angle which measures 120o

Answer: ^ >