Lesson: Law of Cosines
In this lesson, we will learn how to find the sides and angles in non-right triangles using the law of cosines.
Sample Question Videos
Worksheet: 25 Questions • 4 Videos
is a triangle, where , , and . Find the length giving the answer to three decimal places.
is a triangle where , and the area is cm2. Find the other lengths and angles giving lengths to one decimal place and angles to the nearest degree.
The side lengths of a triangle are , , and . Emma calculated, to one decimal place, the measures of the corresponding angles as , , and . Was she correct?