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

ACT Math: Plane Geometry Drill 4, Problem 5. What is the height of the prism?

ACT Math: Plane Geometry Drill 5, Problem 5. How much material do you need to cover the entire tent?

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.

Don't try this at home, Shmoopers.

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?

This video can run circles around other videos about circles. Sir Cumference, of Round Table fame, explains all the properties of… well, circles....

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."

SAT Math 1.1 Geometry and Measurement. What is the circumference of the circle?

No hard hat needed here–we're talking about mathematical constructions. If you're using a straight edge, a compass, and a pencil, you're working...

ACT Math: Plane Geometry Drill 5, Problem 3. What is the measure of Angle GHJ?

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

Who knew triangles had midsegments? We did.

ACT Math: Coordinate Geometry Drill 2, Problem 2. Which expression is depicted by the number line?

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.

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...

Want to figure out the area and perimeter of irregular shapes? Break them down into regular shapes. For example, a flower can be broken down into s...

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

SAT Math 4.1 Geometry and Measurement

CAHSEE Math: Mathematical Reasoning Drill 3, Problem 4. Which of the expressions gives the best estimate as to the length of this quadrilateral's p...

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...

Mosquitos need their caffeine, just like the rest of us. Wouldn't think zipping around and stinging people all day long sap your energy?

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

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...