Question

Q2. Construct the angles 120° &
90° using compasses and ruler.​

Answer 1

construction of 120°

.Step 1 :

Draw a line segment. Mark the left end as point O and the right end as point B.

Step 2: Take the compass and open it up to a convenient radius. Place its pointer at O and with the pencil-head make an arc which meets the line OB at say, P.

Step 3: Without disturbing the radius, place the pointer at P and make an arc that cuts the previous arc at a point, say Q.

Step 4: Similarly, with the same radius on the compass, place the pointer at point Q. Mark another arc on the first arc. Mark the point where they intersect as A.

Step 5: Draw a line from O through A

90-degree Angle (90°)

A 90-degree angle lies exactly halfway between a 120-degree angle and a 60 degree angle on a 360 degree scale. For its construction, you first construct a 60° angle and a 120° angle Then, construct an angle bisector between these two angles. Now, you get the required 90 degree angle.

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