All
Humanities
Math
7th grade (U.S.)
8th grade (U.S.)
Algebra
Exponent expressions and equations
Graphing and analyzing linear functions
Introduction to algebra
Linear equations
Linear inequalities
Multiplying and factoring expressions
Quadratic equations
Systems of equations and inequalities
Arithmetic and pre-algebra
Addition and subtraction
Applying mathematical reasoning
Arithmetic properties
Decimals
Exponents, radicals, and scientific notation
Factors and multiples
Fractions
Measurement
Multiplication and division
Negative numbers and absolute value
Ratios, proportions, units and rates
Telling time
New and noteworthy
Science
Talks and interviews
Sort By

Newest

Perimeter and area of a non-standard polygon

Perimeter and Area of a Non-Standard Polygon

Khan Academy
Perimeter and area of non-standard shapes
574
03:02

Perimeter of a parallelogram

Khan Academy
Perimeter and area of non-standard shapes
572
01:19

Area of a kite

Khan Academy
Perimeter and area of non-standard shapes
745
03:48

Area of a trapezoid

Khan Academy
Perimeter and area of non-standard shapes
593
04:47

Area of a parallelogram

Showing that the area of a parallelogram is base times height

Khan Academy
Perimeter and area of non-standard shapes
574
05:41

Quadrilateral properties

Quadrilateral Properties

Khan Academy
Perimeter and area of non-standard shapes
584
05:06

Quadrilateral overview

Basics of quadrilaterals including concave, convex ones. Parallelograms, rectangles, rhombi and squares

Khan Academy
Perimeter and area of non-standard shapes
541
08:23