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| Construction - 3 |
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| To construct angles of 60o, 120o and 30o |
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| (i) Draw a line AB. |
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| (ii) With A as centre, taking any suitable radius, draw an arc which cuts AB at P. |
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| (iii) With P as centre and the same radius, cut the arc at Q. |
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| (iv) From Q, with the same radius, cut the arc at R. |
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(v) Join AQ and produce it to C. Then  |
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(vi) Join AR and produce it to D. Then  |
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| (vii) Take any radius greater than half of PQ. |
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| (viii) Draw two intersecting arcs from points P and Q, with the above radius. |
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| (ix) Join this point of intersection and point A. Produce the line to E. |
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(x) AE bisects  |
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(xi) Hence  . |
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