You write the height. Draw as dashed line segment, which is perpendicular to the base, from the top vertex down to the base (or a dashed line extended from the base for an obtuse triangle). Put a right-angle symbol (small square) where this line segment intersects the base)
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hoe can we draw an altitude
The altitude of a triangle is the distance from the line containing the base to the vertex. Draw the base and continue on outside of the triangle. Measure perpendicular from that line to the vertex.
is the altitude of a triangle
Yes its perpendicular height or altitude is sometimes calculated out side the triangle depending on its shape.
A triangle has three altitudes.