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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...

Don't try this at home, Shmoopers.

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...

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

ACT Math: Plane Geometry Drill 2, Problem 4. What is the surface area of a sphere with radius = 6?

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."

Equations of circles are a no-brainer. If aliens can do it, so can you. All you do is substitute the center of the circle's coordinates into the eq...

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

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)?

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

ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?

ACT Math: Coordinate Geometry Drill 1, Problem 4. In which quadrant is point A?

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

Sounds logical to us!

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...

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 2.1 Geometry and Measurement. What is the measure of angle z in terms of x and y?

SAT Math 5.2 Geometry and Measurement

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

We know what you came here for—you want to hear the latest interview with the hot starlet, Polly Gon. Well, we've got the scoop for you. She's re...

SAT Math 4.3 Geometry and Measurement

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...

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

ACT Math Trigonometry Drill 1, Problem 2. Can you find the tangent?

ACT Math: Trigonometry Drill 1, Problem 3. Can you find the cosine?

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...

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...

ACT Math: Plane Geometry Drill 4, Problem 2. If x, y, and z are all integer values, which of the following cannot be the ratio of x:y:z?

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. Weâ€...

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...