2. Draw an acute-angled ∆PQR. Draw all of its altitudes. Name the point of concurrence as ‘O’.

Step 1: Draw a triangle PQR with an acute angle. You can use a ruler and a protractor to ensure the angles are less than 90 degrees.

Step 2: Draw the altitude from each vertex. The altitude of a triangle is a line segment from a vertex of the triangle to the line containing the opposite side, and it's perpendicular to that line.

• To draw the altitude from vertex P, extend the line QR (if necessary) and draw a line from P to this extended line such that it forms a 90-degree angle with QR.
• Repeat this process for vertices Q and R.

Step 3: The point where all three altitudes intersect is the orthocenter of the triangle. Label this point as 'O'.

Remember, in an acute-angled triangle like ∆PQR, the orthocenter 'O' will always be inside the triangle.