SOLUTION: The perimeter of an isosceles triangle, PQR is 9 cm. The length of side p is 4 cm and the lengths of q and r are equal. a) Determine the lengths of q and r. b) Determine the mea

Algebra ->  Triangles -> SOLUTION: The perimeter of an isosceles triangle, PQR is 9 cm. The length of side p is 4 cm and the lengths of q and r are equal. a) Determine the lengths of q and r. b) Determine the mea      Log On


   



Question 1111728: The perimeter of an isosceles triangle, PQR is 9 cm. The length of side p is 4 cm and the lengths of q and r are equal.
a) Determine the lengths of q and r.
b) Determine the measure of P to the nearest degree.
Thanks :)

Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
x=r=q

2x%2B4=9


x=5%2F2=2%261%2F2


You can use Law Of Cosines to find measure of angle at P.
6.25%2B6.25-2%2A6.25%2Acos%28P%29=16
.
.
cos%28P%29=-0.28
.