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Question

Construct a Δ PQR such that PQ = 6 cm, QRP = 450 and angle PQR = 600 . Locate its incentre and draw its incircle.

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Solution

Steps of Construction

1. Construct a line segment PQ=6 cm.

2. At the point P construct rays which make an angle of 450 and at point Q which makes an angle 60 which intersects each other at point R.

3. Construct the bisectors of P and Q which intersect each other at point I.

4. From the point I construct IL which is perpendicular to PQ.

5. Taking I as Centre and IL as radius construct a circle which touches the sides of ΔPQR internally.

This is the required incircle where the point I is incentre.


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