Posted by sarah a on .
The lengths of segments PQ and PR are 8 inches and 5 inches, respectively, and they make a 60degree angle at P.
(a) Find the area of triangle PQR.
(b) Find the length of the projection of segment PQ onto segment PR.
(c) Find the length of segment QR.

geometry 
Reiny,
a) area = (1/2)(5)(8)sin60
= ..
b) the projection of PQ on PR = 5 cos 60
= ...
c) use the cosine law
QR^2 = 5^2 + 8^2  2(5)(8)cos60
= ... 
geometry 
yadlay,
Reiny,help, how do I find the following
(d) Find the sizes of the other two angles of triangle PQR.
(e) Find the length of the median drawn to side PQ.
(f) Find the length of the bisector of angle R.
(g) Find the third side of another triangle that has a 5inch side, an 8inch side, and the
same area as triangle PQR