A quadrilateral with three equal angles is called a "trapezoid." In a trapezoid, one pair of opposite angles are equal, while the other pair of opposite angles are also equal. The three equal angles in a trapezoid are typically referred to as the base angles, and they are equal to 90 degrees each in an isosceles trapezoid.
There is no specific name for one with 3 equal angles. All the interior angles in a quadrilateral add up to 360°. So you would have 3A + B = 360. Where angles A = C = D. Now a rectangle has 4 equal angles (90°), so it also has 3 equal angles. And just happens to have the 4th angle equal the other 3.
To visualize a quadrilateral with only 3 equal angles: take a square ABCD, and stretch angles A,C & D to 91°. Now angle B will equal 87°.
A rhombus, an equal sided parallelogram or an equal sided quadrilateral with no right angles.
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A quadrilateral with 4 equal sides and 4 right angles is a square.
The description given could be that of a quadrilateral kite.
A Rhombus has four equal sides but not (necessarily) four equal angles.
Quadrilaterals are not triangles, and there is no such thing as a quadrilateral triangle. Perhaps you mean equilateral, in which case, it has 3 equal angles and 3 equal sides; the word equilateral actually means equal sides. And quadrilateral means four sides. Triangle means 3 angles.
Yes, the opposite angles in a regular quadrilateral are equal.
There is no specific name for such a quadrilateral.
A rhombus is a 4 equal sided quadrilateral with equal opposite acute angles and equal opposite obtuse angles with diagonals that bisect each other at right angles.
A rhombus, an equal sided parallelogram or an equal sided quadrilateral with no right angles.
It's impossible for a quadrilateral to have no equal sides and have right angles.
Diagonally opposite pairs of angles will always be equal, but the only time all angles in a quadrilateral parallelogram are equal is when that shape is a rectangle.
Oh, dude, that's like a square, man. It's a shape that's all about right angles and sides that are totally the same length. So, if you're ever in a geometry jam and need to describe a shape that's super square, just remember, it's a square!
A rhombus
A rectangle
An irregular quadrilateral.
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