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Area
Perimeter and area: the basics
: Great geometry primer on perimeter and area. Listen carefully. Sal explains the concepts so you'll understand them.
Area of triangle in grid
: Area of triangle in grid
Area of a parallelogram
: Guess what's interesting about the opposite sides of a parallelogram? That's right....they are parallel! Let's find the area--base times height
Area of a trapezoid
: A trapezoid is a cousin of the parallelogram. However, in trapezoid only two of the opposing sides are parallel to each other. Here's we explain how to find its area.
Here is a great lesson on find the volume of irregular shapes!
Finding area by breaking up the shape
: Don't be intimidated by odd looking geometric figures and being asked to find its area. In this example you'll understand that breaking up the figure into smaller geometric shapes that are regular make the task a lot easier.
Volume
Volume of a rectangular prism: fractional dimensions
: Think of a rectangular prism as a 3 dimensional rectangle. To find the volume of a rectangular prism let's start by finding the volume of a rectangle, and go from there. What do you think we do next??
Volume of a rectangular prism: fractional cubes
: Another way of finding the volume of a rectangular prism involves dividing it into fractional cubes, finding the volume of one, and then multiplying that area by the number of cubes that fit into our rectangular prism. Watch this explanation.
Volume of a rectangular prism: word problem
: This is a cool word problem that puts together what we're learning about finding the volume of rectangular prisms. Follow along with Sal closely...he does a great job explaining.
Surface Area
Nets of polyhedra
: We know...."nets of polyhedra" sounds like the title of a bad sci-fi movie about man-eating, muti-headed fish. A polyhedron ("polyhedra" is plural) is nothing more than a 3 dimensional shape with flat surfaces and straight edges (think: cube)
Finding surface area: nets of polyhedra
: Now we shift our focus towards surface area (which is the sum of all the areas of all the shapes that cover the surface of the object). Let's apply it to the polyhedra net we learned about in the previous video. We'll walk you through it.