Construct a ∆ABC with BC = 6.5 cm, AB = 5.5 cm, AC = 5 cm. Construct the incircle of the triangle. Measure and record the radius of the incircle.
Solution:
The circle that encircles a triangle and known as a "inscribed circle." It is the biggest circle that can fit inside the triangle and barely touch either side.
Steps to construct:
Step 1: Draw a line segment BC = 6.5cm.
Step 2: With B as center and C as center draw arcs AB = 5.5cm and AC = 5cm.
Step 3: Join AB and AC.
Step 4: Draw the angle bisectors of B and C. The bisectors meet at point O.
Step 5: With O as the center. Draw an incircle which touches all the sides of the triangle ABC.
Step 6: From point O draw a perpendicular to side BC which cuts at point N.
Step 7: On measuring the radius ON = 1.5cm.
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