The measures of the angles in the triangle are represented as p, q, and r.
Since the angles of a triangle add up to 180 degrees, we have:
p+q+r=180
Angle q is defined as one third of angle p, hence:
q=
p
The angle r is determined by the difference between p and q:
r=p-q
Substituting for q gives:
So, r=p-q=p-
From this, we can derive:
r=
Then it follows:
r=
r=
Given that p+q+r=180, with q=
and r=
, we arrive at:
p+
+
=180
To eliminate the fraction, let's multiply the complete expression by 3:
3*p+ 3*
+ 3*
=3*180
We simplify to find:
3p+p+2p=540
Thus, 6p=540
Dividing by 6 gives us:

So, p=90
With p=90, we find:
q=
q=
q=30
And for r, we calculate:
r=
r=
r=
Thus, we conclude p=90, q=30, r=60
The triangle's angle measures are 90, 30, and 60