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Here’s a cheeky way to do math.

Kim Kardashian’s naked butt broke the internet — but now it’s helping to fix students’ understanding of basic geometry.

Catalyst, a test prep company, is using the ultimate semi-circle in its latest pop-culture-inspired questions to get kids primed for the SAT. (See questions below).

Catalyst’s interest in Kardashian’s image from the cover of Paper magazine is not just sexploitation. It’s downright Platonic.

“Kim Kardashian’s backside is almost perfectly circular,” company founder Jared Friedland tells the Daily News. “As soon as we saw that, it occurred to me that we could teach three types of geometry questions.”

And as every eighth grade boy knows, Friedland is talking about circumference, angles and area of a circle. The median age of the test taker is 16, so Kardashian’s naked butt is a perfect topic to cover.

For all three questions, Friedland superimposed circles atop Kardashians’s famous rump — and he must know what he’s doing because 85% of his students improve their scores by at least 200 points when they take a Catalyst course.

Students at Millennium High School in the Financial District were nonplussed by Friedland’s math.

"I could definitely solve it given time, but I think it would be distracting," said William Faba 16.

"It’s definitely a distraction," added Priscilla Pappas, 16. "It wouldn't encourage math it would just encourage discussion about butts and women."

But sometimes such a discussion is exactly what’s needed, added student Lauren Enochs, 15.

"We talked about Kim in my English class," she said. "My teacher used her as an example for the vocabulary word ‘lascivious.’"

It’s not first time pop culture inspired pop quizzes for Friedland. A few years ago, Friedland’s team used before and after shots of Ashlee Simpson’s nose job to quiz students on calculating the slope of a line.

So are you as smart as a 14 year old? Take the test below.

1. The celebrity booty pictured on the left has an area of 64 pi and is divided into eight congruent regions. What is the perimeter of one of these regions?

a) (16 + 32 pi)/3

b) (16 + 8 pi)/3

c) (16 + 4 pi)/3

d) 16 + 2 pi

The covers that started it all.

e) 16 + 4 pi

Answer D: First remember the rule: Area of a circle equals pi times the radius squared. So the radius of this circle is the square root of 64, or 8. So the two radii making up the straight lines of the segment equal 16. To get the length of the curved portion, remember that the perimeter of the entire circle is pi times the diameter. So find the perimeter (16 pi) and divide by eight. Then add.

2. If the radius of the Kardashian on the left is 12 and the area of the highlighted, ahem, feature is 48 pi, what is the measure of the interior angle of sector indicated?

e) No clue, but, man, I sure like geometry.

Answer D: The area of the entire circle is 144 pi. So divide 144 by 48. The shaded portion is one-third of the whole, so the angle must be one-third of 360 degrees.

3. If a magazine editor were to photoshop the region on the left so that its diameter were doubled in length, what would be the resulting ratio of the new region’s area to the original regions area? (Not that a magazine editor would ever do such a thing, of course.)

Answer C: This one is easy. The area of a circle is pi times radius squared. So if you double the diameter, the resulting circle is four times bigger.

For info about test prep, email info@catalystprep.com or call 800-235-0056.

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Test prep company uses Kim Kardashian’s butt to teach math