WEBVTT

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A parallelogram is a blank with
two sets of parallel lines.

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So let's see what
the options are.

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So one option is
a quadrilateral.

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And a parallelogram is
definitely a quadrilateral.

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A quadrilateral is
a four-sided figure,

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and it is definitely
a four-sided figure.

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A parallelogram is
not always a rhombus.

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A rhombus is a special case of a
parallelogram where not only do

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you have to sets
of parallel lines

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as your sides, two
sets of parallel sides,

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but all of the sides are the
same length in a rhombus.

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And a square is a special
case of a rhombus where

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all of the angles
are 90 degrees.

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So here, all we can say
is that a parallelogram

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is a quadrilateral.

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And so let's check our answer.

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And it's always a good
idea to look at hints.

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And so it'll kind of say the
same thing that we just said,

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but it would say it for
the particular problem

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that you're actually looking at.

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Let's do a few more of these.

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Suzanne is on an expedition
to save the universe.

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Sounds like a reasonable
expedition to go on.

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For her final challenge,
she has to play

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a game called Find
the Rhombuses.

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A wizard tells her that she
has a square, a quadrilateral,

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and a parallelogram,
and she must

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identify which of the
shapes are also rhombuses.

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Which of these shapes should
she pick to save the universe?

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So a square is a special
case of a rhombus.

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Just to remind ourselves, a
rhombus, the opposite sides

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are parallel to each other.

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You have two sets
of parallel sides.

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A square has two sets
of parallel sides,

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and it has the extra condition
that all of the angles

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are right angles.

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So a square is definitely
going to be a rhombus.

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Now, all rhombuses
have four sides.

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So all rhombuses
are quadrilaterals.

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But not all quadrilaterals
are rhombuses.

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You could have a quadrilateral
where none of the sides

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are parallel to each other.

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So we won't click this one.

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Once again, a parallelogram.

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So all rhombuses
are parallelograms.

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They have two sets
of parallel sides,

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two sets of parallel
line segments

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representing their sides.

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But all parallelograms
are not rhombuses.

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So I would say that if
someone gives you square,

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you can say, look, a square is
always going to be a rhombus.

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A quadrilateral isn't always
going to be a rhombus,

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nor is a parallelogram
always going to be a rhombus.

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We got it right.

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