thinking im using the calculator wrong. heres my work.
c²=48² + 40² -2(48)(40) cos113º
c²=2304 + 1600 -2(48)(40) cos113º
c²=3904-3840 cos113º
√3904-3840cos113º <--inputing this into the calculator which it tells me it = to c² = -0.99756405026
i dont think thats right though.
