Points A(-1,4), B(3,12) and C(7,-2) are given. Find (to the nearest tenth of a degree) the measure of <BAC.

- Apr 17th 2008, 04:35 PMhelp1Points A(-1,4), B(3,12) and C(7,-2) are given. Find (to the nearest tenth of a degre
Points A(-1,4), B(3,12) and C(7,-2) are given. Find (to the nearest tenth of a degree) the measure of <BAC.

- Apr 17th 2008, 05:39 PMtopsquark
- Apr 17th 2008, 10:23 PMSoroban
Hello, help1!

Quote:

Points are given.

Find (to the nearest tenth of a degree) the measure of

The angle between two lines with slopes

. . is given by: .

We have: .

. . . . and: .

Hence: .

Therefore: .