13
QuizMultiple Choice
Area and Perimeter of Triangles — Unit test
Question 13 • OH-Geometry B
Law of cosines: a2 = b2 + c2 – 2bccos(A)
Answer
A
92 = y2 + 192 – 2(y)(19)cos(41°)B
y2 = 92 + 192 – 2(y)(19)cos(41°)C
92 = y2 + 192 – 2(9)(19)cos(41°)D
y2 = 92 + 192 – 2(9)(19)cos(41°)