SAT Math skill
Angles, triangles, circles, area and volume, and right-triangle trigonometry: about 15% of SAT Math.
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Learn how a circle’s equation describes its center and radius, how to graph it, and how to rewrite expanded equations by completing the square.
Read articleTurn an angle and watch the sides, sine, cosine, and tangent change in real time. Then learn the complement rule and the special triangles behind many SAT trigonometry questions.
Read articleDouble the side of a cube and its volume grows eightfold. Explore scale factors with an interactive model, review the formulas on the SAT reference sheet, and practice the questions that trip students up.
Read articleArc length, sector area, and radians all come from one idea: what fraction of the circle are you working with? Drag an interactive sector and watch every measurement update together.
Read articleWhen a line crosses two parallel lines, eight angles appear, but they take only two values. Explore an interactive diagram, then use the triangle rules that solve most angle questions.
Read articleSimilar triangles have the same shape at different sizes, so their sides share one ratio. Learn to match corresponding sides, use the parallel-line shortcut, and solve shadow problems.
Read articlePractice Geometry and Trigonometry
Turn an article into points: practice a few questions on this skill while the idea is fresh.