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Drawing Angles

Drawing Angles. Slideshow 41, Mathematics Mr Richard Sasaki Room 307. Objectives. Understand how to draw 90 o and 60 o angles Understand how to bisect and add to these to make other angles (such as 30 o and 120 o ). Drawing Angles.

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Drawing Angles

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  1. Drawing Angles Slideshow 41, Mathematics Mr Richard Sasaki Room 307

  2. Objectives Understand how to draw 90o and 60o angles Understand how to bisect and add to these to make other angles (such as 30oand 120o)

  3. Drawing Angles I’m starting to see people with set squares helping them draw angles. Remember, you must use a compass!

  4. 90o Angle So far, we have constructed some shapes and bisected lines and angles. Today we will draw some angles. We already know how to draw a 90o angle so today we will use a slightly different method. (There are quite a few different ways to do this.)

  5. 90o Angle Label a point D somewhere above and close to the line segment. Draw and label a right-angle with line segments of any length starting at vertex A. Make distance AD the radius of the compass.

  6. Try Q1 – 4! Next, draw an arc from D that passes through the line segment, point A and above point A again. 90o Angle Draw a line segment from the new crossing made, through D and then up to the point above A. Draw a line segment from A to the point above it… And finally, remove the line passing through D! Don’t forget to label it!

  7. 60o is easy! Let’s draw it as for line segments and . 60o Angle Measure the compass just over half and draw a large arc from P covering where may go. From the point made, draw a mark over the arc and then join this mark to point P. R Finally connect P to this and label it and label the angle! 60o

  8. You can just simply cut the 30o angle in half, but there is a quicker way! 30o Angle Measure the compass just over half of a segment again and draw an arc in the same placeand name the crossing S. Place the point at S and cross the arc. Make a point T.

  9. Try Q5 – 9! Place the point at T and cross over the new point. Label this point R. 30o Angle 30o Finally, draw a line segment and label the angle.

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