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ACT Math: Plane Geometry Drill 4, Problem 1. What is the radius of the sphere?

SAT Math 9.5 Geometry and Measurement

Measurement and Geometry Drill 4 Problem 1. What is the total volume of the figure?

This video explains the vertical angle theorem. Learn about supplementary angles, adjacent angles, and linear pairs, plus bungee jumping. Intersect...

FYI: cats don't like to get wet. Okay, so that fact won't be relevant every time you solve trig equations, but it happens to be this time.

We inscribed some angles on the walls of our office, but our boss got mad, so we made this video instead.

Los cubos de hielo no son ruidosos generalmente...pero tienen un volumen de tipo diferente. Este video te enseñará cómo encontrar el volumen de...

Volume is crucial to our lives. It determines the amount of food we eat, the amount of fluid we drink, and hydraulics, just to to name a few. One o...

Haven't you always wondered how much cardboard it takes to encase a trunk warmer for your pet elephant?

Time to learn about the area of a sector. And no, that's not the sector's bedroom with a bumper sticker on the door that reads, "GO AWAY."

It's super useful to be able to find the distance around stuff. Like when you’re being pursued by authorities while running around the base of an...

ACT Math: Plane Geometry Drill 5, Problem 4. What is the radius and coordinate center of the circle?

To prove lines are parallel, you need a third line. We at Shmoop (and the rest of the world) call it a transversal.

ACT Math: Coordinate Geometry Drill 5, Problem 2. Which of these three lines are parallel?

SAT Math 11.4 Geometry and Measurement. What is the y-intercept of a line parallel to y – 2x = 4 and passing through the point (1, 2)?

Who knew triangles had midsegments? We did.

Talk about math being applicable to real life.

One formula to rule them all, one formula to find them. One formula to bring them all, and in the darkness bind them. Or something like that. I...

If you already know what a conditional statement is, then you're smarter than you look. And boy do you look smart.

Indirect proofs (or proofs by contradiction) prove their conclusion by showing that the opposite cannot be true. You can use this in math and in ar...

Formal proofs present the oh-so-mathematical evidence in two columns: one for the statement they are claiming is true, and the other for the reason...

This video explores parallel lines and transversals: how to identify them both on a math test and in real life urban planning. What do the consecut...

Prove it, Shmoopers. We dare you.

To prove lines are parallel, you need a third line. We at Shmoop (and the rest of the world) call it a transversal.

Curious to find out what angle these guys are playing? Check out this video. You’ll have angles coming out of the wazoo.

SAT Math 4.3 Geometry and Measurement

“Polygon” - it’s not just something we say when our pet parrot escapes through the kitchen window. Curious to find out what angle these guys...

These simple quadrilaterals are so cool that some people break the law just to measure them. We're guessing that homework problems will help you ge...

Rectangles just love to have perimeters. And we just love to measure them.

SAT Math 4.1 Geometry and Measurement

Verifying trig identities is important, especially when you're about to let one of them into the country—which is why they should keep their pass...

Sine is the opposite over the hypotenuse; cosine is the adjacent over the hypotenuse; and tangent is the opposite side over the adjacent side....

Shmoop saw the sine. Want to pull an Oliver Twist and ask us for more? We've gotcha covered. Head over to /video/math/ for more mathy goodness. No...

Bien, tú no eres el único que cae completamente en el aburrimiento por un rato. Dos figuras geométricas dimensionales también. ¿Cómo ellos pu...

If you were looking for the trailer for the new Michael Bay movie, you've got the wrong number. Transformations are rotations, reflections, and tra...

Translations: now without the trans fat. Functions: now without the…fun? Wait, scratch that. Now with extra fun! Don’t believe us? There's only...

This video covers the different types of triangle. What makes a triangle isosceles, scalene, or equilateral? What about the different kinds of angl...

Sine is the opposite over the hypotenuse; cosine is the adjacent over the hypotenuse; and tangent is the opposite side over the adjacent side....

Someday you might be a big, fancy defense lawyer, and you'll have to prove that your client's triangle was congruent to the triangle in question. W...

We’ve got a problem. Actually, we’ve got a ton of them. Fortunately, they’re only geometric word problems, which really aren’t so bad. We�...

How do you figure out how long you have before the Galapagos Zombie Tortoises eat you? By using math, of course. If you can't solve this problem, w...

Simple steps to solving geometry word problems. If only the problems themselves were this simple...