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What polygon and three angles and three sides and one of the angles is greater than 90 degrees?
An obtuse angled triangle.
Can a triangle have a reflex angle?
The three interior angles of a triangle can only be Acute or Obtuse. However, the external component of these three angles is reflex.
Can a acute triangle be an obtuse triangle?
No, all three angles must be less than 90 degrees each in an acute triangle. In an obtuse triangle one of the angles is greater than 90 degrees. A triangle with a 90 degree angle is called a right triangle.
Does an isosceles triangle have a angle greater than 90?
It can. An example of an isosceles triangle without any angles greater than 90 would be an equilateral triangle, with all angles equalling 60 degrees. An example with an angle greater than 90 would be a triangle with angles of 100 degrees, 40 degrees and 40 degrees. You couldn't have an isosceles triangle with 2 angles greater than or equal to 90, as all the angles sum to 180 degrees.
Can an obtuse triangle be regular why?
No - not a plane triangle. The angles of a regular triangle must be equal. So an obtuse triangle, if regular, would have three obtuse angles. The sum of the angles would then be greater than 3*90 = 270 degrees. But the sum of angles of a triangle must be 180 degrees.
