construct the angle of 90o using protractor by
Alice Akinyi
6
Angles at a point
Each arrow shows an angle of 90°
An angle of 90°is a quarter of ofacircle as drawn above
Example 1
Angle ABC =90°
Angle ABD= 90°
Example 2
Measuring a 90° using a protector
Shows 90°
Constructing a 90°angle
- Using a ruler and compasses draw a line 5cm.
- Mark more than a half the radius on the line 5cm.
- Mark the center A as shown in the diagram a side.
- Using B and C as enters Mark arcs as shown a side
- Mark the point where the two arcs meet D
Draw a line from point D to point A
What do you notice ?
The angle formed is a right angle which is 90°
QUESTION 1
Draw a 90° angle using a ruler and compasses only
ANSWER
QUESTION 2
