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Problem
Problem
If
r
r
1
=
r
2
r
3
\frac{r}{r_1} = \frac{r_2}{r_3}
r
1
r
=
r
3
r
2
, then show that
C
=
90
∘
C = 90^\circ
C
=
9
0
∘
.
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