If in triangle ABC, tan A + tan B + tan C = 6 and tan A tan B = 2, then the triangle is
A
Right angled isosceles
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B
Acute angled isosceles
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C
Acute angled
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D
equilateral
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Solution
The correct option is C Acute angled In a ΔABC, tan A + tan B + tan C = tan A tan B tan C ⇒ 6 = 2 tan C ⇒ tan C = 3 ⇒ tan A + tan B = 3 ⇒ tan A = 1, tan B = 2 and tan C = 3 [∵ tan A tan B = 2]