### Lumos Video Store

## This page provides a list of educational videos related to Perimeter Side Lengths. You can also use this page to find sample questions, apps, worksheets, lessons , infographics and presentations related to Perimeter Side Lengths.

# Finding perimeter when a side length is missing | Math | 3rd grade | Khan Academy

##

By Khan Academy

Lindsay finds the perimeter of a figure when a side length is not given.

**In this video**

# Introduction to perimeter

##

By Khan Academy

Find perimeter by adding side-lengths of various figures.

**In this video**

# Finding perimeter

##

By Khan Academy

Find perimeter by adding side-lengths of various figures.

**In this video**

# Identifying proportional relationships

##

By Khan Academy

Is the perimeter of a square proportional to the side length of the square?

**In this video**

# Grade 3 Math Perimeter 3 MD 8

##

By EngageNY

Solve real world problems involving perimeters of polygons, including finding the perimeter given the side lengths and finding an unknown side length

**In this video**

# Estimating Products | MathHelp.com

##

By MathHelp.com

This lesson covers perimeter. Students learn that the perimeter of a figure is the distance around the figure, so the perimeter of a figure can be found by adding the lengths of its sides. Since all four sides of a square are equal in length, the perimeter of a square that has a side with a length of 8 feet is 8 + 8 + 8 + 8, or 32 feet. Since opposite sides of a rectangle are equal in length, the perimeter of a rectangle that is 4.5 meters by 6.2 meters is 4.5 + 4.5 + 6.2 + 6.2, or 21.4 meters.

**In this video**

# Perimeter | MathHelp.com

##

By MathHelp.com

This lesson covers naming angles. Students learn the definition of an angle and the concept of measure, including the following vocabulary: side, vertex, protractor, degrees, right angle, acute angle, obtuse angle, and straight angle. Students also learn what assumptions can and cannot be made from a given figure.

**In this video**

# Surface Area of a Pyramid | MathHelp.com

##

By MathHelp.com

This lesson covers the definition of perpendicular lines. Students learn the definition of perpendicular lines and use algebra to find the measures of angles in problems that involve perpendicular lines. Students are also asked to determine whether given information is sufficient to determine if two lines are perpendicular.

**In this video**

# Perimeter Word Problems | MathHelp.com

##

By MathHelp.com

This lesson covers the area of a trapezoid. Students learn that a trapezoid is a quadrilateral with one pair of parallel sides, and the formula for the area of a trapezoid is 1/2 times (base 1 + base 2) times height. For example, the area of a trapezoid that has bases of 10 centimeters and 12 centimeters and a height of 8 centimeters is 1/2 times (10 + 12) times 8, which simplifies to 1/2 times 22 times 8, or 11 times 8, which is 88 square centimeters.

**In this video**

# Geometry Introduction - Basic Overview - Review For SAT, ACT, EOC, Midterm Final Exam

##

By The Organic Chemistry Tutor

**In this video**

# 3rd Grade Math Rap

##

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**

# 2nd Grade Math Compilation

##

By

2nd Grade math is fun with these learning videos! Each lesson can help students with word problems, math games or help prepare for a test! Great for a review of 2nd grade or for an introduction!

**In this video**

# Learn XY Coordinate Plane, Graphing Points, Lines & Distance - [5-9-15]

##

By Math and Science

Quality Math And Science Videos that feature step-by-step example problems!

**In this video**