Question

Determine a tangente do ângulo agudo formado entre r e s, sendo: a) r: y=2x+5 e s: y= -3x+5

Answer 1

m=-a/b
mr=-2/5
ms=3/5
mr*ms = -2/5*3/2
tg rs =  | mr-ms    |
            | 1-mr*ms |

tg rs =| -2/5 -3/2__ | = |-9/10    |   = |-9/10  | = -90/40 = 9/4 
          | 1-(-2/5*3/2)|    |  1-6/10|       |  4/10 |