A triangular lot bounded by three streets has a length of 300 feet on one street, 250 feet on the second, and 420 feet on the third. Find the measure of the largest angle formed by these streets. Which of the following equations can be used to solve the problem?

Question

anonymous · Answer

looks like a law of cosines problem. The largest angle is opposite the longest side

anonymous · Answer

thanks

p0sitr0n · Answer

still need help?

anonymous · Answer

yea.....  idk how to do this, i know that the equation is$$c^2=a^2+b^2-2ab(cosC)$$ but  i don't know how to apply it.

anonymous · Answer

|dw:1434124669566:dw|
Let's say this is our triangle
a, b, and c are the lengths and A, B, C are angles