If, in a triangle, (1- r_1 r_2 ) (1- r_1 r_3 )=2, then the triangle…

MATHEMATICS · Single correct · A Level · Mathematics · Trigonometry · Trigonometry

Problem

If, in a triangle,

\left(1-\frac{r_1}{r_2}\right)\left(1-\frac{r_1}{r_3}\right)=2,

then the triangle is (1) Right-angled (2) Isosceles (3) Equilateral (4) None of these