Classify Quadrilaterals-Geometry-Level D

Added: 2026-05-25

[00:00:08]Quadrilaterals are shapes with four sides.

[00:00:12]Let's learn more about their sides and angles.

[00:00:18]Remember, an angle that is 90° is a right angle.

[00:00:24]Angles that are less than 90° are acute angles.

[00:00:29]And angles that are between 90° and 180° are obtuse angles.

[00:00:35]We can find these types of angles in quadrilaterals.

[00:00:39]Let's try it.

[00:00:44]What type of angle is angle A?

[00:00:56]What type of angle is angle B?

[00:01:07]What type of angle is angle C?

[00:01:19]What types of angles are in both of these shapes?

[00:01:31]What types of angles are in both of these shapes?

[00:01:40]Remember, parallel lines never intersect. They are always the same distance apart.

[00:01:47]So, when two sides of a shape are always the same distance apart, they're called parallel sides.

[00:01:53]Let's take a closer look.

[00:01:58]Which sides of this shape are parallel?

[00:02:04]A quadrilateral with at least one pair of parallel sides is called a trapezoid.

[00:02:12]Which of these shapes is a trapezoid?

[00:02:23]Which sides of this shape are parallel?

[00:02:29]A trapezoid with two pairs of parallel sides is called a parallelogram.

[00:02:36]Which of these shapes is a parallelogram?

[00:02:47]Sort each shape by how many pairs of parallel sides it has.

[00:03:23]Imagine drawing lines along the opposite sides of this shape. Would the lines eventually intersect?

[00:03:59]>> Squares, rectangles, and rhombuses all have two pairs of parallel sides. They are parallelograms.

[00:04:08]Remember, when two lines intersect and create right angles, they're called perpendicular lines.

[00:04:15]So, when two sides of a shape make a right angle, they're called perpendicular sides. Get ready to try it.

[00:04:25]Look at quadrilateral PQRS.

[00:04:28]Which pair of sides is perpendicular?

[00:04:36]Look for a pair of sides that meets at a right angle.

[00:04:54]Sides RS and SP are perpendicular.

[00:05:03]Which sides of this shape are perpendicular?

[00:05:12]Sort each shape by whether it has any parallel or perpendicular sides.

[00:06:16]>> [music] >> What do all these shapes have in common?

[00:06:32]These shapes each have four sides.

[00:06:34]They're all quadrilaterals.

[00:06:41]What do all these quadrilaterals have in common?

[00:06:47]These quadrilaterals each have two pairs of parallel sides. They're all parallelograms.

[00:06:58]Complete this sentence.

[00:07:00]All parallelograms have sides the same length.

[00:07:11]What do all rectangles have in common?

[00:07:15]Choose yes if a statement describes all rectangles. Choose no if it doesn't.

[00:07:32]What do all rhombuses have in common?

[00:07:46]>> What do all squares have in common?

[00:07:59]Which of these categories do all three shapes belong to?

[00:08:12]Which of these categories do all three shapes belong to?

[00:08:26]Which of these categories do all three shapes belong to?

[00:08:39]>> [music] >> Use the clues to solve the riddle. I'm a quadrilateral with only one pair of parallel sides. Which shape am I?

[00:08:58]I am a parallelogram. I have two acute angles. Which shape am I?

[00:09:10]I am a parallelogram. I have no obtuse angles. Which shape am I?

[00:09:25]I am a rhombus. I have perpendicular sides. Which shape am I?

[00:09:36]>> [music] >> Which shape has one right angle?

[00:10:00]Which shape has two obtuse angles?

[00:10:10]What types of angles are in each of these quadrilaterals?

[00:10:19]Which shape has two pairs of parallel sides?

[00:10:28]Which shape has perpendicular sides?

[00:10:39]Which category do both shapes belong to?

[00:10:50]Which category do all of these shapes belong to?

[00:11:11]Quadrilaterals are shapes with four sides.

[00:11:14]Let's learn more about their sides and angles.

[00:11:21]Remember, an angle that is 90° is a right angle.

[00:11:27]Angles that are less than 90° are acute angles.

[00:11:31]And angles that are between 90° and 180° are obtuse angles.

[00:11:38]We can find these types of angles in quadrilaterals.

[00:11:41]Let's try it.

[00:11:46]What type of angle is angle A?

[00:11:59]What type of angle is angle B?

[00:12:12]What type of angle is angle C?

[00:12:23]What types of angles are in both of these shapes?

[00:12:35]What types of angles are in both of these shapes?

[00:12:44]Remember, parallel lines never intersect. They are always the same distance apart.

[00:12:51]So, when two sides of a shape are always the same distance apart, they're called parallel sides.

[00:12:58]Let's take a closer look.

[00:13:02]Which sides of this shape are parallel?

[00:13:08]A quadrilateral with at least one pair of parallel sides is called a trapezoid.

[00:13:16]Which of these shapes is a trapezoid?

[00:13:27]Which sides of this shape are parallel?

[00:13:34]A trapezoid with two pairs of parallel sides is called a parallelogram.

[00:13:41]Which of these shapes is a parallelogram?

[00:13:51]Sort each shape by how many pairs of parallel sides it has.

[00:14:46]Squares, rectangles, and rhombuses all have two pairs of parallel sides. They are parallelograms.

[00:14:55]Remember, when two lines intersect and create right angles, they're called perpendicular lines.

[00:15:02]So, when two sides of a shape make a right angle, they're called perpendicular sides.

[00:15:08]Get ready to try it.

[00:15:12]Look at quadrilateral PQRS.

[00:15:15]Which pair of sides is perpendicular?

[00:15:26]>> Which sides of this shape are perpendicular?

[00:15:36]Sort each shape by whether it has any parallel or perpendicular sides.

[00:16:36]>> [music] >> What do all these shapes have in common?

[00:16:51]These shapes each have four sides.

[00:16:53]They're all quadrilaterals.

[00:17:00]What do all these quadrilaterals have in common?

[00:17:08]These quadrilaterals each have two pairs of parallel sides. They're all parallelograms.

[00:17:19]Complete this sentence.

[00:17:21]All parallelograms have sides the same length.

[00:17:31]What do all rectangles have in common?

[00:17:36]Choose yes if a statement describes all rectangles. Choose no if it doesn't.

[00:17:53]What do all rhombuses have in common?

[00:18:10]What do all squares have in common?

[00:18:25]Which of these categories do all three shapes belong to?

[00:18:39]Which of these categories do all three shapes belong to?

[00:18:52]Which of these categories do all three shapes belong to?

[00:19:02]>> [music] >> Use the clues to solve the riddle.

[00:19:11]I'm a quadrilateral with only one pair of parallel sides. Which shape am I?

[00:19:25]I am a parallelogram. I have two acute angles. Which shape am I?

[00:19:38]I am a parallelogram. I have no obtuse angles. Which shape am I?

[00:19:50]I am a rhombus. I have perpendicular sides. Which shape am I?

[00:20:04]>> [music] >> Which shape has one right angle?

[00:20:29]Which shape has two obtuse angles?

[00:20:40]What types of angles are in each of these quadrilaterals?

[00:20:48]Which shape has two pairs of parallel sides?

[00:21:00]Which shape has perpendicular sides?

[00:21:11]>> Which category do both shapes belong to?

[00:21:22]Which category do all of these shapes belong to?