Question
Question: If the diameter of an ex-circle be equal to the perimeter of the triangle then the triangle is-...
If the diameter of an ex-circle be equal to the perimeter of the triangle then the triangle is-
A
Right angled
B
Isosceles
C
Right angled isosceles
D
Equilateral
Answer
Right angled
Explanation
Solution
r1 = s tan A/2,
Given 2s tan A/2 = 2s, tan A/2 = 1, A = π/2.
You can not say about right angled triangle.