How do I find the area of the polygon to these 4?????????? I'm so lost
For the one with the sides = 11 and 21, remeber that you have a triangle and a rectangle, that when added together yield the total area.
so, the area of the rectangle is obviously 11*21 and to find the area of the triangle you gotta use a little trig to find the base before you can apply the formula $\displaystyle A=\frac{1}{2}bh$. So how do we find the base. Easy $\displaystyle \tan{5}=\frac{21}{b}$, therefore, $\displaystyle b=\frac{21}{\tan{5}}$. Got it?