draw triangle DEF with DE=4cm EF= 5cm CD = 90° draw it's circumcircle with postion of its circumcentre
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⇒ Draw a line segment BC=6cm
⇒ Take B and C as a center with radius 6cm and draw an arc meeting at point A.
⇒ Join AB and AC. We get ABC as the required equilateral triangle.
⇒ Draw a perpendicular bisector on sides AB,BC,AC meeting at point O.
⇒ Take O as the center with radius equal to OA and draw a circle.
⇒ We have to measure radius of the circumcircle, i.e the measure of length of OA.
∴ Radius of circle is 3.5≈2
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