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| Construction - 4 |
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| To construct angles of 90o, 45o and 135o |
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| (i) Draw a line AB and mark any point O on it. |
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| (ii) With O as centre, draw an arc of any
suitable radius which cuts AB at P. |
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| (iii) With P as centre and the same radius, cut this arc at Q. |
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| (iv) From Q, with the same radius, cut the arc again at R. |
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| (v) Join OQ and OR. |
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(vi) Construct OC which bisects  |
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(vii) Then  |
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(viii) Construct OF which bisects  |
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(ix) Then  |
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