1. Intro to perimeter & area
Great geometry primer on perimeter and area. Listen carefully. Sal explains the concepts so you'll understand them.
5. Area & perimeter of rectangles word problems
Find the missing side length of a rectangle when given its perimeter or area. Compare perimeters and areas of rectangles.
8. Area of parallelogram proof
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
10. Area of trapezoids
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.
11. Area of kites
Learn how to find the area of a kite. A kite is a type of quadrilateral that is symmetric around one of its diagonals.
13. Finding area by rearranging parts
Sometimes it helps to rearrange the parts of geometric figures to find the area. That's what we're going to do here.
14. Area of composite shapes
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.
15. Area challenge
Practice solving problems involving triangles, parallelograms, and composite figures. Exercises include decimals, fractions, and word problems. Area of circles is not included.
17. Area of a quadrilateral on a grid
Again, some quadrilaterals can be oddly shaped so break it up into shapes where finding the area is more easily determined.
18. Area of composite shapes
Practice finding the areas of complex shapes that are composed of smaller shapes.