?

Trigonometry

Free Version

Upgrade subject to access all content

Difficult

Area, Triangle, Law Cosines, Three Known Sides

TRIG-WV7OAE

If you are given a triangular piece of wood with the following dimensions, $11\;cm,\;18\;cm\;$ and $\;20\;cm$, what is the area of that piece of wood to the nearest square cm?

A

$98.4\; sq.\; cm$

B

$150.8\; sq.\; cm$

C

$117.4\; sq.\; cm$

D

$178.3\; sq.\; cm$