# Find the area of the polygon

• May 13th 2009, 04:50 PM
live504
Find 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 PM
VonNemo19
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 $A=\frac{1}{2}bh$. So how do we find the base. Easy $\tan{5}=\frac{21}{b}$, therefore, $b=\frac{21}{\tan{5}}$. Got it?
• May 13th 2009, 05:11 PM
VonNemo19
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 PM
live504
nope, not a clue.