Ask a New Question

In triangle ABC, a=7.8, b=4.2, c=3.9. Find B

a. 15.1°
b. 148.7°
c. 78.9°
d. 16.2 °

It is D, right?

1 answer

Looks like a situation for the law of cosines.

b^2 = a^2 + c^2 - 2ac cos B
17.64 = 60.84 + 15.21 - 60.84 cos B
cos B = 0.9601
B = 16.2 degrees

Ask a New Question or answer this question.

Similar Questions

Given the coordinates of a triangle, A (-3,-4), B (5,-2), C (-5,6)1. Find the midpoints of each side of the triangle 2. Find the
1. 3 answers
In the accompanying diagram, triangle ABCis similar to triangle DEF, AC = 6, AB = BC = 12, and DF = 8. Find the perimeter of
1. 1 answer
the verticies of triangle R(0,12), S(-6,6), and T(4,8). write in slope-intercept form the equations of the lines that contain
1. 2 answers
Read the followingTo determine the transformations made to triangle \( \triangle ABC \) to produce triangle \( \triangle XYZ \)
1. 1 answer

more similar questions