Author Archives: hangtime

Area of SAS Triangles Using Trig

If you've seen this formula in class -- Area = .5(b)(c)(sinA) -- this video is for you. If you haven't seen it in class, it's basically just a plug-and-chug version of using SohCahToa to find area, so maybe you'll like it.

This video appears on the page: Area of Triangles

Heron's Formula for Triangle Area

Yeah, Heron's Formula. Or as students usually refer to it: "That formula with the big square root and a lot of minus signs that's named after some guy and tells you the area of a triangle?"

This video appears on the page: Area of Triangles

Areas of Triangles Using Special Triangles (SAT)

These ones are like the SohCahToa ones, except if you're not allowed to use a calculator, it better be a 30-60-90 or 45-45-90. And there are some triangles that aren't special but you're supposed to realize could be split into special triangles, so this video covers those too. Very important.

This video appears on the page: Area of Triangles

Areas of Triangles Using SohCahToa

When you're supposed to find the area of a triangle and they give you an angle as well as a side (and you can use calculators), chances are you're supposed to use SohCahToa (trig), even when it's not a right triangle. This video walks you through some common examples, and trick traps to avoid.

This video appears on the page: Area of Triangles

Areas of Triangles Using SohCahToa

When you're supposed to find the area of a triangle and they give you an angle as well as a side (and you can use calculators), chances are you're supposed to use SohCahToa (trig), even when it's not a right triangle. This video walks you through some common examples, and trick traps to avoid.

Areas of Triangles Inside Circles (SAT)

Oh man, if you plan on taking the SAT ever, this is definitely a video you're going to want to watch. Sure, it will help you in geometry class too, especially when you're looking at those crazy circle diagram problems. Circles and triangles: so different, yet they seem to always show up in the same problems.

This video appears on the page: Area of Triangles ,SAT Free Videos

Area of Triangles with Equations of Lines

Yet another very specific type of triangle area problem that you'll probably see. Math teachers love two things -- equations of lines, and trying to make you love equations of lines -- so when they get into the triangles chapter, they love to create triangles made of equations and ask you to find the area!

This video appears on the page: Area of Triangles

Areas of Triangles on Coordinate Axes

This is the type of problem every teacher uses where instead of telling you the length of sides of the triangle, they will instead give you the coordinates of the corners of the triangle on the X-Y axes. These can be confusing, but if you use the step-by-step process in this video, you'll be untrickable!

This video appears on the page: Area of Triangles

Areas of Triangles Using Pythagorean Theorem

Another must-watch video. One of the ways a test or teacher can make triangle problems harder is by not giving you all the information you need to plug into the area formula. The Pythagorean Formula is one common way to find missing information, even in triangles that are NOT right triangles.

This video appears on the page: Area of Triangles

Basic Triangle Area Problems

When you first learn how to find the area of a triangle, they just give you triangles and tell you the dimensions and ask for area. This video introduces the A=1/2 x base x height formula, and works a bunch of daigram problems, including a few of the trickier ones that a teacher might pull on you on the test.

This video appears on the page: Area of Triangles

The Triangle Area Video That Will Save You

Yes, this is the most important triangle video you will ever watch. No, I won't give it away by telling you this ultra-important trick here, because as simple as the trick is, you won't fully appreciate it unless you see me yell it at you in a video.

This video appears on the page: Area of Triangles

What Is An Altitude

The definition of altitude is pretty straightforward for most students, so maybe you're thinking this video is too basic. Not true! The most common triangle trick on the SAT and other standardized tests is to make altitudes tricky -- by rotating the triangle and/or making it obtuse -- so this video is worth watching if you ever plan on taking a test that involves triangles!

This video appears on the page: Area of Triangles

Area of Triangles by:
Pythagorean
SohCahToa
X-Y Coordinates
Word Problems
SAS
Heron's Formula

This topic includes videos covering just about every type of triangle area problem, all listed by type. Plus, a couple of videos that are going to SAVE YOUR BACON on every triangle problem you'll ever see, including on the SAT!

Part of the course(s): Geometry

Rectangle Area Word Problems

By request, rectangle area word problems! Yeah, these are the good stuff, carefully designed to show you the kinds of tricks teachers pull. There's questions about: how much paint to cover a room; how many tiles to cover a floor; it's awesome.

This video appears on the page: Area of Rectangles and Squares

How to Convert Units of Area

The biggest trick teachers pull in area problems is trying to mess you up with units. Sometimes they're not even trying, it just happens. They'll give you the size of a room in feet, but then the measurements of the tiles to fill it in inches. At the very least, you've got to know how to convert them, but that's not as easy as you may think.

This video appears on the page: Area of Rectangles and Squares

What Are Units of Area?

This may seem like a simple question. But besides knowing that there are such things as square feet and square meters, it's also very important to know why that word "square" is in there. Know that, and the other tips in this video, and area problems get a lot easier.

This video appears on the page: Area of Rectangles and Squares

Areas of Rectangles & Squares

You probably think the formula for area of squares and rectangles -- A = bh -- is pretty easy. And you'd be right. But this video also covers the weirder problems your teacher might ask you, like solving for x when they give you area, area of rectangles on a coordinate system (x-y axes), and how to know which side is the "base" and which is the "height".

This video appears on the page: Area of Rectangles and Squares

Area of Rectangles and Squares
&
Area Unit Conversions
What Are Units of Area?
How to Convert Units of Area
Areas of Rectangles & Squares
Rectangle Area Word Problems

Besides rectangles and squares, this chapter covers other basics of area such as how to convert units for area problems, such as from square cm to square meters (cm^2 to m^2) or square inches to square feet (in^2 to ft^2).

Part of the course(s): Geometry

Tough 3-Way Venn Diagrams

This video covers Venn Diagrams where there are up to three different circles, with complements and universes and everything else that makes Venn diagrams so fun. These are pretty hard, so if you haven't seen this in class or your text book, feel free to skip this one!

This video appears on the page: Venn Diagrams ,free videos edit ,Free Sample Videos ,middle school math free videos ,geometry free videos

Venn Diagrams with Complements

Complements are that little ' symbol you sometimes see next to a set, which means "everything else" or "not". When you see one in a Venn Diagram problem, it basically turns the whole thing inside out.

This video appears on the page: Venn Diagrams