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

Oldest

Challenging triangle angle problem

Interesting problem finding the sums of particular exterior angles of an irregular pentagon

Khan Academy
Triangle angles
495
06:24

Finding more angles

Example of angle hunting!

Khan Academy
Triangle angles
537
06:04

Triangle angle example 1

Figuring out angles in a triangle. A little about exterior angles being the sum of the remote interior angles

Khan Academy
Triangle angles
506
06:02

Triangle angle example 2

Another example finding angles in triangles

Khan Academy
Triangle angles
510
04:54

Triangle angle example 3

Multiple ways to solve for the angles of multiple triangles

Khan Academy
Triangle angles
496
05:41