Fine the area of this triangle. I don’t know how to do it so it would help if you show me how too as well. Thanks

gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects.

the answer is 8/21

hope this