Answer:

Explanation:
The area of a triangle can be solved for using the formula:

where
is the length of the triangle's base and
is the length of its height (altitude).
Both
and
are given to us for the shown triangle, so all we have to do is plug the given values into the triangle area formula above.



Note that the height of the triangle is given on the outline of an auxiliary (dotted) right triangle. This is just to show that the height is in fact an altitude, meaning it is perpendicular to the base, not at the angle of the triangle's other sides.