a. Find the area of a triangle in which A=60degrees, b=182.5cm,c=160cm .
b. Calculate the area of a regular fifteen-sided figure inscribed in a circle of radius 10cm.
plz help thank you for any help.
For the first one you can use trigonometry to find the height of your triangle and proceed to find area the normal way $\displaystyle A_{triangle}=\frac{1}{2}bh$
For the second one do you know the formula
$\displaystyle A_{\text{regular n-gon}}=\frac{1}{2}\alpha{p}$
where p is the perimiter and alpha is the apothem?
My advice for the first one would be to draw the picture, from there I think you will be able to see what you need to do,
For the second one the apothem is more of a visual concept, so look here and see if you can glean how to do it from that. If not post back
Apothem - Wikipedia, the free encyclopedia