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Annulus
Calculates the area of an annulus and the equation of the annulus using the radius of the large and small concentric circles.

Arc Length and Area of a Sector of a Circle
Calculates the arc length of a circle and the area of the sector of a circle

Chord
Solves for any of the 3 items in the Chord of a Circle equation, Chord Length (c), Radius (r), and center to chord midpoint (t).

Circle Equation
This calculates the standard equation of a circle and general equation of a circle from the following given items:
* A center (h,k) and a radius r
* A diameter A(a1,a2) and B(b1,b2)
This also allows you to enter a standard or general form equation so that the center (h,k) and radius r can be determined.

Circles
Calculates and solves for Radius, Diameter, Circumference, and Area of a Circle.

Equilateral Triangle
Given a side (a), this calculates the following items of the equilateral triangle:
* Perimeter (P)
* Semi-Perimeter (s)
* Area (A)
* altitudes (ha,hb,hc)
* medians (ma,mb,mc)
* angle bisectors (ta,tb,tc)