Posted by **sarah a** on Thursday, April 15, 2010 at 10:34pm.

The lengths of segments PQ and PR are 8 inches and 5 inches, respectively, and they make a 60-degree 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**, Thursday, April 15, 2010 at 10:41pm
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**, Thursday, April 15, 2010 at 11:01pm
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 5-inch side, an 8-inch side, and the

same area as triangle PQR

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