Question

Name the given triangle after finding the value of x.

Answer 1

In ∆DEF,

x° + 2x° + 3x° = 180°

⇒ 6° = 180°

⇒ x° = 30°

∴ ∠E = x° = 30°

∠D = 2x° = 60°

and ∠F = 3x° = 90°

∆DEF is a right angled triangle.