505. Find the area of a right triangle with legs measuring 3 and 5.
$\triangleright$ Two such triangles can form a $3 \times 5$ rectangle, so the area of each of them is half the area of the rectangle, which is $3 \cdot 5 / 2 . \triangleleft$

![](https://cdn.mathpix.com/cropped/2024_05_21_90703b5d5e76e3b5cd3dg-154.jpg?height=200&width=280&top_left_y=1508&top_left_x=1436)

The solution to the previous problem shows that the area of a right triangle is half the product of its legs.

In the next problem, you need to find the area of a triangle that is not a right triangle.