Q. 54.5( 52 Votes )
Let A, B be the centres of two circles of equal radii; draw them so that each one of them passes through the centre of the other. Let them intersect at C and D.
Examine whether 
and 
are at right angles.
Answer :
Step 1: Draw a line segment of any given length
Step 2: With A as center and radius AB draw a circle. With B as a center and radius, BA draw a circle. Join C and D. Measure angle with a protractor.
So AB is perpendicular to CD.
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