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How do I find the area of the polygon to these 4?????????? I'm so lost

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- May 13th 2009, 04:50 PMlive504Find the area of the polygon
http://www.mathhelpforum.com/math-he...1&d=1242262152

How do I find the area of the polygon to these 4?????????? I'm so lost - May 13th 2009, 05:03 PMVonNemo19
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? - May 13th 2009, 05:11 PMVonNemo19
You can pretty much use the same reasoning to solve the rest of the polygons. You know what I mean?

- May 13th 2009, 05:34 PMlive504
nope, not a clue.