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1, How we can construct an angle of 60^{o}.

Step1 : Draw a line segment AB

step 2 : With A as centre and any radius draw an arc cutting AB at C.

Step 3: With C as centre and the same radius as before cutoff the arc at D

Step 4 : Join AD

step 5 : Then BAD = 60^{o}

2, How we can construct an angle of 120o?

Step: 1 Draw a line segment AB

Step 2 : With A as centre and any radius draw an arc cutting AB at C.

Step: 3: With C as centre and the same radius as before cut off the arc first at D and then finally at E by taking D as centre.

Step : 4 Join AE

Step: 5 Then BAE = 120^{o. }

3, How can we construct an angle of 30^{o} ?

First construct an angle of 60o as explained before and then bisect this angle.

4, Explain the construction of 90^{o} angle.

Step 1 : Draw a line segment AB

Step 2 : With A as centre and any radius draw an arc 1 cutting AB at C

Step 3 : with C as centre and the same radius as before draw an arc z cutting the previous arc at D.

step 4 : With D as centre and the same radius draw an arc 3 cutting the arc 1 drawn to step 2 at E.

Step 5 : Now with D and E as centres and radius more than ^{1}/_{2} DE, draw arac s. 4 and 5 cutting each other at F.

step 6 : Jopin at A F.

Step 7 : Then BAF = 90^{o}

construction

5, Explain the construction of angle of 45^{o} ?

Step 1 : First draw an angle of 90^{o}

step 2 : Bisect this angle by AH

Step 3 : Then BAH = 45^{o}

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Std 5

ICSE/ISC