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Question

Consruct an equilateral triangle ABC of side 5 cm. Draw a circle circumscribing the ABC. Find the length of the circumradius.


A

2.9 cm

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B

3.8 cm

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C

2.0 cm

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D

4.9 cm

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Solution

The correct option is A

2.9 cm


Construct a ABCof side 5 cm.

Draw the perpendicular bisectors of any two sides of the triangle.

Let the perpendicular bisectors meet at point O.

Taking O as the centre and radius equal to OA (or OB or OC) draw the circle.

Measure OA, circumradius = 2.2 cm


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