Level 3-1

Circle Basics

Drag the sliders to move and resize a circle. Discover how h, k, and a control the equation (x−h)²+(y−k)²=a².

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0 /3 Tasks

Tasks

Move the sliders and discover how circles change. Earn up to 3 stars per task!

Set the radius to 5. Task 1

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Move the center to (3, −2). Task 2

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Make a unit circle (radius = 1, centered at the origin). Task 3

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Start with Set the Radius to see how the size changes, then move the center and build a unit circle.

Tip: In the circle equation (x−h)²+(y−k)²=a², the parameter a is the radius, and h and k shift the center left/right and up/down.