Draw a rough sketch of triangle PQR. Draw all its altitudes. ,Mark its Orthocentre as O.

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Solution

Orthocentre of a Triangle – Orthocentre of a triangle is defined as the intersection of all the three altitudes of triangle from its three vertex.
Step 1 - Draw a triangle PQR -

Step 2 - Draw three altitudes from P to QR , from Q to PR and R to QP -

Intersection point of all the three altitudes is O , is called Orthocenter.

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