It's super useful to be able to find the distance around stuff. Like when you’re being pursued by authorities while running around the base of an enormous water tower. Trust us—it's gonna happen.

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Perimeter of a Rectangle 
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Attributes of Circles 
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Area of a Sector 
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Equations of Circles 
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The Tangent Function 
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Tangent HalfAngle Formula 
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Secant Angles 
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Perimeter of Irregular Shapes