Pythagorean theoremThe rule that in a right triangle, the squares of the two shorter sides add up to the square of the longest side: a² + b² = c².
You’ll leave with these skills
01Find a circle’s center and radius from its graphClick the circle’s top and bottom points in Desmos, then take the point halfway between them as the center and half the distance between them as the radius.
02Spot the circle that touches an axis at exactly one pointGraph every answer choice and pick the circle that shows only one gray point on the axis the question names.
03Find every point where a line crosses a circleGraph the line and the circle together and click each gray point where they cross.
04Calculate area and volume from a formula in DesmosType each letter’s value from the question in its own input box in Desmos, then type the formula to get the answer.
This lesson is part of the full library
207 lessons that teach every skill the SAT tests
71Math
40Reading
24Grammar
10 full-length practice tests to build test-day stamina and confidence
A Desmos simulator to solve math questions faster
A step-by-step guide to every practice test question
The Bluebook Simulator, so test day feels familiar
A drawing for every key term, so new ideas make sense at a glance
