Question

If a = 57, b = 30, c = 68, use the Law of
Cosines to solve the triangle.
a) What is A? Answer in units of ◦

b) What is B?
Answer in units of degree

c) What is C?
Answer in units of degree


If a = 57, b = 30, c = 68, use the Law of
Cosines to solve the triangle.
a) What is A? Answer in units of ◦

b) What is B?
Answer in units of degree

c) What is C?
Answer in units of degree


@Mathematics

Answer 1

cos A = (a^2-b^2-c^2)/-2bc
cos A =( 57^2-30^2-68^2)/-2(30)(68)
cos A = .557598
A=56.1 degrees
cos B =( b^2-a^2-c^2)/-2ac
cos B = (30^2-57^2-68^2)/-2(57)(68)
cos B = .8995
B=25.9 degrees
C = 180 - 56.1-25.9=98.0 degrees