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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°.

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Q: What quadrilateral has 3 equal angles?
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Does a quadrilateral triangle have exactly 2 congruent 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.


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It's impossible for a quadrilateral to have no equal sides and have right angles.


If a quadrilateral is a parallelogram will it always have equal 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.


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A rhombus


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A quadrilateral has three equal angles what type of quadrilateral is it?

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