They are both polygons and their exterior angles add up to 360 degrees
They make four triangles, not a triangle.
No, a triangle will never have parallel sides.
A lack of a fourth side. ;)
A triangle is not a quadrilateral. A quadrilateral consists of four sides, and a triangle only has three.
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 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.
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, trapezoids are quadrilaterals, they have 4 sides. Triangles have 3 sides.
No. Quadrilaterals have four sides and triangles have only three!
By a single straight line only into triangles or quadrilaterals.
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.