Instructional Video
Khan Academy

SAT Prep: Test 1 Section 9 Part 3

9th - 12th
If it takes a long time to complete the problems on the math SAT, it doesn't matter if they are correct - the problems that are left over will count against the student's score. Sal takes care to show quicker ways to complete problems...
Instructional Video3:54
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Curated OER

What is the Pythagorean Theorem?

6th - 11th
Need to find the length of a side of a right triangle? Just use the Pythagorean Theorem! Follow along as the tutor defines the Theorem, explains how it works, then uses it to determine the missing length of a right triangle. 
Instructional Video7:21
Curated OER

How Do You Find the Lateral and Surface Areas of a Cone if You Don't Know the Slant Height?

9th - 11th
Did you know you can use the Pythagorean theorem to find the slant height of a cone? You can! Just watch this tutorial and see how you can find the lateral and surface area of a given cone using slant height and the Pythagorean theorem.