# Resolve triangle

• Jul 31st 2007, 04:20 PM
Patrick_John
Resolve triangle
The base of an isosceles triangle is 30cm and the angles formed by the base and the equal sides are 35 grades 35 minutes, how to get the other sides and angle?

I'd be able to solve it if I'd have 2 sides, but with one side I'm confused.

Thanks.
• Jul 31st 2007, 04:37 PM
topsquark
Quote:

Originally Posted by Patrick_John
The base of an isosceles triangle is 30cm and the angles formed by the base and the equal sides are 35 grades 35 minutes, how to get the other sides and angle?

I'd be able to solve it if I'd have 2 sides, but with one side I'm confused.

Thanks.

Use the Law of Sines:
$\frac{sin(A)}{a} = \frac{sin(B)}{b} = \frac{sin(C)}{c}$

-Dan
• Jul 31st 2007, 05:38 PM
Patrick_John
But I only have "a", "B" and "C". I only know how to use the law of sins when I have
-"a" and "A"
-"b" and "B"
-"c" and "C"
and another side or angle.

Thanks
• Aug 1st 2007, 04:07 AM
topsquark
Quote:

Originally Posted by Patrick_John
But I only have "a", "B" and "C". I only know how to use the law of sins when I have
-"a" and "A"
-"b" and "B"
-"c" and "C"
and another side or angle.

Thanks

If you have a, B = C then you can use A + B + C = 180 to get the third angle.

-Dan
• Aug 1st 2007, 02:07 PM
Patrick_John
Thanks :D!