No two sides of a triangle are ever parallel, and although
it isn't required, a triangle can have all acute angles.
That isn't possible for any shape with more than 3 sides.
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all cogruent sides 2 acute angles 2 obtuse angles 2 sets of parallel lines the acute angles are 45 degrees the obtuse angles are135 degrees
A quadrilateral is a four-sided polygon (closed shape made with line segments). Quadrilaterals have four angles (vertices) and come in many different shapes, depending on the length of their sides and the kinds of angles they have. The five most common quadrilaterals are the rectangle, square, parallelogram, rhombus, and trapezoid. A rectangle is a quadrilateral with opposite sides congruent (same length) and parallel. It has four right (90º) angles. A square has ALL four sides that are congruent, and two pairs of parallel sides. It also has four right angles. A parallelogram has two pairs of parallel sides. They form two acute and two obtuse angles. A rhombus has two pairs of parallel sides, but all sides are congruent. They also form two acute and two obtuse angles. Finally, a trapezoid, has only one pair of parallel sides. The parallel sides are NOT congruent. A trapezoid can be formed by two acute and two obtuse angles, or by two right angles, one acute, and one obtuse angle.
An equilateral triangle.
Yes, because all angles are 60 degrees, and all sides are the same, therfore all angles are 60 degrees, which are acute angles.
A Rhombus had 2 pairs of parallel sides and has NO right angles. :)