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Q: Does an obtuse triangle have a regular shape?

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An obtuse triangle has 3 sides.

No.

Irregular

An obtuse triangle has one of its angle greater that 90 degrees.His plate was in the shape of an obtuse triangle.

No because an equilateral triangle is a regular polygon whereas an obtuse triangle is irregular

It is irregular

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.

An obtuse triangle or an isosceles triangle if the 2 acute angles are equal in size

No because a trapezoid is a 4 sided quadrilateral whereas an obtuse triangle is a 3 sided shape.

an angle that is above 180 degrees

No because an obtuse angle is greater than 90 degrees and a regular triangle is an equilateral triangle that has 3 equal 60 degree angles that add up to 180 degrees.

if you are talking about regular polygons, then nothing has an obtuse angle. otherwise, pretty much any shape can have an obtuse angle

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