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Construction of 90o

Construction of 90o

 


Take any ray OA. With O as centre and any convenient radius, draw an arc cutting OA at C.
With C as centre and the same radius, draw an arc cutting the first arc at B.
With B as centre and the same radius, draw an arc cutting the first arc again at D.
With B and D as centres, and radius more than half of BD draw two arcs, cutting each other at E. Join OE.

EOA = 90o.
 




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