Since one of the angles is 80°, the sum of the other two will be 100°. It is isosceles. So, the other angles will be 50° and 50°.
Steps of Construction:
1. Draw a line segment AB = 4.8 cm.
2. Draw 50° angles at A and B.
3. Extend them such that they meet at C.
4. Join AC and BC.
Therefore, Δ PQR is the required isosceles triangle in which AC = BC.
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