Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
In
△
P
Q
R
\triangle PQR
△
P
QR
,
P
Q
=
P
R
PQ = PR
P
Q
=
P
R
. The exterior angle at
Q
Q
Q
formed by extending
R
Q
RQ
R
Q
measures
140
∘
140^{\circ}
14
0
∘
. Find
∠
R
\angle R
∠
R
of the triangle.
Browse the problem library