The altitudes of a triangle intersect at .

$P, Q$ and $R$ are the midpoints of the sides of the triangle $ABC$. What type of quadrilateral is $PQCR$?

$\mathrm{ABC}$ is an equilateral triangle of side $2\mathrm{a}$, then length of one of its altitude is $a\sqrt{x}$. The value of $\mathrm{a}$ is _____.

In the figure, identify the Altitude

Which of the following figures will have it's altitude outside the triangle?

Draw all three altitudes for the following triangles and explain how they are different:

If $\mathrm{\Delta }\mathrm{E}\mathrm{B}\mathrm{D}$ is a right triangle, name the two altitudes of $△\mathrm{EBD}$.

Write the definition of the altitude of a triangle.

In the equilateral triangle $\mathrm{A}\mathrm{B}\mathrm{C}$, the three altitudes $\mathrm{A}\mathrm{L}$, $\mathrm{B}\mathrm{M}$, $\mathrm{C}\mathrm{N}$ have been drawn that intersect at $\mathrm{O}$.
$\mathrm{B}\mathrm{O}=\mathrm{C}\mathrm{O}$