They are both polygons and their exterior angles add up to 360 degrees
No, a triangle will never have parallel sides.
They make four triangles, not a triangle.
A lack of a fourth side. ;)
A triangle is not a quadrilateral. A quadrilateral consists of four sides, and a triangle only has three.
It depends on the pyramid. Common bases are a triangle and a square but other quadrilaterals and polygons with more than 4 sides are also possible.
No. A triangle is a 3-sided figure and a quadrilateral is a 4-sided one. Are all triangles quadrilaterals? No. None of them are. no because they only have three sides
It could be a triangle, a quadrilateral, a pentagon, a hexagon or even an octagon if they are two concave quadrilaterals.
No, parallelograms are specific to quadrilaterals (shapes with 4 sides).
No, quardrilateral means a shape having four sides, and triangle means a shape having 3 sides so no quardilateral is triangle * * * * * True, but the question had nothing to do with triangles! A kite or a rhombus are quadrilaterals but they are not rectangles. So, although some quadrilaterals are rectangles, not all are.
No. Quadrilaterals have four sides and triangles have only three!
No, trapezoids are quadrilaterals, they have 4 sides. Triangles have 3 sides.
By a single straight line only into triangles or quadrilaterals.