Because a triangle has 3 sides whereas a parallelogram has 4 sides
yes
2
There are normally no parallelograms within an isosceles triangle unless you put them there yourself.
No, parallelograms are specific to quadrilaterals (shapes with 4 sides).
They are a miscellaneous collection of polygons.
A prism has a variety of bases but the sides are always parallelograms. A triangular prism has a triangle as the two bases and parallelograms as lateral sides. A pyramid has a variety of bases but the sides are triangles.
Nope, never. Parallelograms are classified as having 1 or 2 sets of parallel sides, not triangles.
Triangles have only three sides; all quadrilaterals, including parallelograms, have four.
Because parallelograms include rhombuses, squares, and rectangles, any triangle would be one of those split in two. If you are thinking about a parallelogram that cannot be classified any more specifically, then it would be a scalene triangle.
No trapezoids are parallelograms, and no parallelograms are trapezoids.
No trapezoids are parallelograms, and no parallelograms are trapezoids.
Any geometrical figure can have any area. Triangles can be constructed of any desired size, and so can parallelograms.