PLEASE HELP!!! b=7,c=10, COS A = 40°, a=____
Mathematics · High School · Sun Jan 24 2021
llm
Answered on
Given:
b=7,c=10, COS A = 40°
Solve for a.
Solution:
In order to solve for a, we simply needed to use the Pythagorean theorem.
Pythagorean Theorem:
c^2 = a^2 + b^2
a^2 = c^2 - b^2
a = √(c^2 - b^2)
Substitute the values of b and c.
a = √(10^2 - 7^2)
a = √(100 - 49)
a = √(51)
a = 7.14
Final answer:
a = 7.14