Quadrilateral Worksheets - Free Printable

Let’s go step by step to fill in the blanks correctly.

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First blank: “Quadrilateral- A ________ with ____ sides.”

A quadrilateral is a polygon — that means it’s a closed shape made of straight lines. And “quad” means four, so it has 4 sides.

→ So: polygon, four

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Second part: “Parallelograms- A ________ with two pairs of opposite ________ sides.”

A parallelogram is also a type of quadrilateral (so again, a polygon). The key feature is that both pairs of opposite sides are parallel.

→ So: quadrilateral, parallel

Then: “The parallelograms include a ________, ________, and ________.”

Looking at the diagram under “PARALLELOGRAM”, we see: Rhombus, Rectangle, Square. These are all special types of parallelograms.

→ So: rhombus, rectangle, square
*(Order doesn’t matter, but these are the three shown.)*

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Third part: “Kite- A ________ with two pairs of adjacent ________ sides.”

A kite is a quadrilateral too. Its defining feature is that it has two pairs of *adjacent* (next to each other) sides that are equal in length.

→ So: quadrilateral, equal

*(Note: Some definitions say “congruent” instead of “equal”, but for middle school level, “equal” is fine. Also, sometimes they say “two distinct pairs of adjacent congruent sides” — but here, just “equal” fits the blank.)*

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Fourth part: “Trapezoid- A ________ with one pair of ________ sides.”

Again, trapezoid is a quadrilateral. In most U.S. curricula, a trapezoid is defined as having *at least* one pair of parallel sides — but this worksheet says “one pair”, which matches the exclusive definition (exactly one pair). We’ll go with what the worksheet implies.

→ So: quadrilateral, parallel

Then: “An isosceles trapezoid also has one pair of ________ sides.”

Isosceles trapezoids have non-parallel sides (the legs) that are equal in length.

→ So: equal

*(Sometimes called “congruent legs”, but again, “equal” works for this level.)*

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Now let’s put it all together carefully:

✔ Quadrilateral → polygon, four
✔ Parallelogram → quadrilateral, parallel; includes rhombus, rectangle, square
✔ Kite → quadrilateral, equal
✔ Trapezoid → quadrilateral, parallel; isosceles has equal (non-parallel) sides

All answers match standard geometry definitions taught in middle/high school and align with the diagram provided.

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Final Answer:
Quadrilateral- A polygon with four sides.
Parallelograms- A quadrilateral with two pairs of opposite parallel sides. The parallelograms include a rhombus, rectangle, and square.
Kite- A quadrilateral with two pairs of adjacent equal sides.
Trapezoid- A quadrilateral with one pair of parallel sides. An isosceles trapezoid also has one pair of equal sides.