# Math Help - analytic geom

1. ## analytic geom

this time, i'll ask about how to get the angle in degrees in a coordinate system.

so here's the question:

The vertices of a quadrilateral are located at A(-1,-2), B(3,-4), C(2,3), and D(-2,2).

Q: Find the angle in degrees between sides BC and CD.

2. Originally Posted by fishlord40
this time, i'll ask about how to get the angle in degrees in a coordinate system.

so here's the question:

The vertices of a quadrilateral are located at A(-1,-2), B(3,-4), C(2,3), and D(-2,2).

Q: Find the angle in degrees between sides BC and CD.
Use the distance formula to find the lengths of BC, and CD and BD.

Then use the cosine rule to find the angle in between BC and CD.

3. my final answer is 84.09 degrees.