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Obtuse triangle is one that has one of the angles in the triangle > 90º

Acuteuse triangle is one that has all angles in the triangle < 90º

 By inspection,

(a) is right-angled triangle as  ∠BAC looked to be equal to 90º.

(b) is obtuse-angled triangle as  ∠EFD > 90º

(c) is obtuse-angled triangle as  ∠MLN > 90º

(d) is acute-angled triangle as all angles in the triangle < 90º

1 Reply 2 Likes ✔Accepted Answer

I don’t like this question.  Why, angle BAC could be 89.99 degrees for all we know 😆 

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