To inscribe a circle in a given triangle abc construct the given triangle abc 80mm , bisect any two sides of the triangle to obtain o, o as a center draw complete circle to touch both sides.

Here are the correct steps to inscribe a circle in a given triangle ABC:

1. Construct the triangle: Draw the triangle ABC with the given dimensions (e.g., if 80mm refers to a side length, draw it accordingly).
2. Bisect two angles: Choose any two angles of the triangle (e.g., angle A and angle B). Using a compass and straightedge, construct the bisector for angle A and the bisector for angle B.
3. Locate the incenter: The point where these two angle bisectors intersect is the incenter. Let's call this point O.
4. Find the inradius: From the incenter O, draw a perpendicular line segment to any one side of the triangle (e.g., side BC). Let the point where this perpendicular touches the side be D. The length of OD is the radius of the inscribed circle (inradius).
5. Draw the incircle: With O as the center and OD as the radius, draw a circle. This circle will be inscribed within the triangle, touching all three sides.