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# Drawing polygons with coordinates

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By Khan Academy

Sal draws a quadrilateral on the coordinate plane using the coordinates of its vertices.

**In this video**

# Symmetry of two-dimensional shapes

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By Khan Academy

Sal solves the following problem: Two of the points that define a certain quadrilateral are (0,9) and (3,4). The quadrilateral has reflective symmetry over the line y=3-x. Draw and classify the quadrilateral.

**In this video**

# 5.7 Proving that Figures are Special Quadrilaterals (Practice)

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By AutenMath

5.7 Proving that Figures are Special Quadrilaterals (Practice)

**In this video**

# Symmetry of two-dimensional shapes

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By Khan Academy

Sal solves the following problem: Two of the points that define a certain quadrilateral are (-4,-2) and (0,5). The quadrilateral has aï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½reflective symmetry over the lines y=x/2 andï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½y=-2x + 5.ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½Draw and classify the quadrilateral.

**In this video**

# How to Find the Area of a Triangle

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By eHow

In this video learn how the area of a triangle can be determined by multiplying half of the base by the height as a triangle is essentially half of a quadrilateral shape. Calculate the area of a triangle with instructions from a college-level math teacher in this free video on geometry. Narrator draws examples on a whiteboard with marker.

**In this video**

# 5.7 Proving that Figures are Special Quadrilaterals (Lesson)

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By AutenMath

5.7 Proving that Figures are Special Quadrilaterals (Lesson)

**In this video**

# 3rd Grade Math Rap

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By McCarthy Math Academy

With a little help from the group, Mindless Behavior, I have created a math video with lyrics to help my students to understand and apply core math skills for third grade. People of all ages can jam out to this one. Enjoy!

I've got a case of the operation blues.

Because I don't know which one I should use.

Look at the word problem for the clues.

The key words tell you how to choose.

Each means you multiply or you must divide.

Tryna find the total? Then you multiply

Total's in the problem? Then you must divide.

Not quick to solve it, draw it, get it right.

Addition's easy for me and you

Sum, In all, together, and total too.

When do you subtract? How many more?

Fewer? Left? Less? Difference in a score?

Place value's next. Disco on the " dess "

Ones, tens, hundreds, to the left

Thousands, Ten thousands, hundred...thousand

Say the name of the place, yeah.

The value's the amount of the place

For example, 2,060.

The value of the 2 is 2-0-0-0,

The value of the 6 is 6-0.

When you round, find and underline the place

Spotlight to the right, decide the digit's fate

5 or more, add 1 to the rounding place

4 or less, do nothing but walk away, (estimate)

A pen, penny is one, one cent

A Nic-kel is five, a dime is ten cents

25 for a quarter, George Washington

100 cents makes a dollar, there he goes again.

For pictographs, you gotta check out the key

One smiley face might really equal three

For bar graphs, pay attention to the scale

Think it's counting by ones, huh, you'll fail

Fractions are easy, just draw your best.

Here they go from least to greatest

1/12, 1/6, Â¼, 1/3,

Â½, 2/3, Â¾, Fraction nerd!

You see that number on top,

That's called the numerator

It describes the amount

That is being considered

And if you jump down from the fraction bar

Denominator

It's the total number of equal parts.

Let me give you an example:

Leslie Moin has some coins

A total of 9

2 happen to be pennies

While 7 are dimes.

What's the fraction of dimes?

How many coins? 9

How many dimes? 7

Say the fraction -- seven ninths

Length times width is Area

Distance around is Perimeter

Break down the GEOMETRY

3 sides makes triangle

4 sides = quadrilateral

5 pentagon, 6 hexagon

8 octagon, 10 decagon

Lines that never cross - PARALLEL

Lines that meet or cross - INTERSECTING

Lines that form right angles -- PERPENDICULAR

Same shape, same size -- CONGRUENT

Line that cuts in half - SYMMETRY

Up and Down - VERTICAL

Left to Right -- HORIZONTAL

An angle less than right - ACUTE

An angle opened wide - OBTUSE

Ninety degrees square corner - RIGHT ANGLE

Back to triangles

3 sides the same = equilateral

2 sides the same = isosceles

no sides the same = Hey, that's a scalene right!

So, that's it.

That's our math song.

Before we leave,

Remember to read

Your math problems three times before you answer.

That way you know what the problem

Is asking you to do.

Don't be lazy, be brilliant.

Piece! Like a fraction.

**In this video**

# Interactive Read Aloud (video style format for all learners) The Greedy Triangle - YouTube

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By Mathster Vakkas

Interactive Read Aloud (video style format for all learners) The Greedy Triangle - YouTube

**In this video**