# Draw and locate the orthocetre of a right angled triangle PQR right angled at Q with PQ=4.5cm and QR=6cm

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Using the compasses, measure QR = 6 cm on the ruler then cut an arc on the line segment taking Q as centre. The point of intersection is R.

Construct a right angle at Q.

Cut the ray which makes right angle with QR at P with a measurement 4.5 cm

Join PR to form a right triangle.

As you know, the orthocentre of a right triangle lies at the vertex containing the right angle.

Hence, the vertex Q is the orthocentre.