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Prepdle

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Circle equations, points, and tangentsTactic

Tactic

Circle equations, points, and tangents

Get to standard form, then read center and radius

10 min 6 stepsGraded practice at the end

Every circle equation gives away where its center is hiding. My hiding spots were always within a fixed radius of the cafeteria.

Meet it
Spot it
Run it
Dodge the traps
Play with it
Prove it

The first step is free. A free account opens the rest.

Calls on

Complete the squareTechniqueAdd half the x-coefficient, squared, to both sides
Circle equation and arc proportionTechniqueRead center and radius, then slice arcs by angle
Test a point; read a regionTechniquePlug the point in, then read the line and the shading
Use slope and intercept relationshipsTacticRead the slope first, then apply one rule
Solve a nonlinear equationTacticLet the form pick the method, then check every root
Slope and average rate of changeTechniqueChange in output over change in input, same order

Other routes

Graph it (Desmos)TacticTurn the question into a point you can click