Using ruler and compass only, draw a right angle.
 
                Answer: 
            
        - Draw a ray ^@OA^@. 
- With ^@O^@ as the center and any convenient radius, draw an arc, cutting ^@OA^@ at ^@P^@. 
- With ^@P^@ as the center and the same radius, draw an arc, cutting the arc drawn in step 2 at ^@Q^@. 
- With ^@Q^@ as the center and the same radius, draw an arc, cutting the arc drawn in step 2 at ^@R^@. 
- With ^@Q^@ as the center and the same radius, draw an arc. 
- With ^@R^@ as the center and the same radius, draw an arc, cutting the arc drawn in the previous step at ^@B^@. 
- Draw ^@OB^@ and produce it to ^@C^@.^@\angle AOC^@ is the angle of measure ^@90^\circ^@. 
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