Classifying Quadrilaterals & Triangles

Quadrilaterals

A closed figure with four sides. Quadrilateral                                                         A closed figure with four sides. Quadrilateral

A quadrilateral with one pair of parallel sides. Trapezoid

Two pairs of parallel sides Parallelogram

A parallelogram with two pairs of congruent sides and four congruent angles. Rectangle

A parallelogram with four congruent sides Rhombus

A parallelogram with four congruent sides and four congruent angles. Square

Triangles

A triangle with three acute angles 60° Acute Triangle A triangle with three acute angles 40° 70°

Right Triangle A triangle with one right angle.

A triangle with one obtuse angle. Obtuse Triangle A triangle with one obtuse angle. 115°

A triangle with all sides congruent. Equilateral Triangle A triangle with all sides congruent. 12 in. 12 in. 12 in.

Isosceles Triangle A triangle with two congruent sides.

Scalene Triangle A triangle with NO congruent sides.

Exactly One Pair of parallel sides Two Pairs of Parallel sides Category No sides Parallel Exactly One Pair of parallel sides Two Pairs of Parallel sides Four right angles Four congruent Sides Trapezoid Parallelogram Rectangle Rhombus Square

1) A parallelogram with four right angles.

2) A rectangle with four congruent sides.

3) A quadrilateral with two pairs of parallel sides.

4) A parallelogram with four congruent sides.

5) A rhombus with four right angles.

6) A parallelogram with four congruent sides and four congruent angles.

A parallelogram is _________ a rectangle. Always, Sometimes, or Never A parallelogram is _________ a rectangle. Sometimes A rectangle is _________ a parallelogram. ALWAYS A square is _________ a rhombus. ALWAYS

Who is correct? A square is a parallelogram with 4 right angles! No way, a square is a rhombus with 4 right angles!