Name  Formula  Legend 
Disk area surface  Show source$S:=\pi\cdot{ R}^{2}$ 

Disk or circle circumference  Show source$L:=2~\pi\cdot R$ 

Disk radius from area surface  Show source$R:=\sqrt{\frac{ S}{\pi}}$ 

Disk radius from area  Show source$L:=2~\sqrt{\pi\cdot S}$ 

Disk (circle) circumference from circumference  Show source$R:=\frac{ L}{2~\pi}$ 

Disk (circle) area from circumference  Show source$S:=\frac{{ L}^{2}}{4~\pi}$ 

Name  Formula  Legend 
Disk area surface  Show source$S:=\pi\cdot{ R}^{2}$ 

Parallelogram area  Show source$S:= a\cdot h$ 

Rectangle area  Show source$S:= a\cdot b$ 

Rectangle diagonal  Show source$d:=\sqrt{{ a}^{2}+{ b}^{2}}$ 

Rectangle area from diagonal  Show source$S:=\frac{1}{2}\cdot{ d}^{2}\cdot\sin\left( \alpha\right)$ 

Rhombus area  Show source$S:=\frac{1}{2}\cdot e\cdot f$ 

Square area  Show source$S:={ a}^{2}$ 

Square area from diagonal  Show source$S:=\frac{{ d}^{2}}{2}$ 

Trapezoid area  Show source$S:=\frac{\left( a+ b\right)}{2}\cdot h$ 

Triangle area (general)  Show source$S:=\frac{1}{2}\cdot a\cdot h$ 

Equilateral triangle area  Show source$S:=\frac{ a\cdot\sqrt{3}}{2}$ 

Isosceles triangle area  Show source$S:=\frac{ b}{4}\cdot\sqrt{4~{ a}^{2}{ b}^{2}}$ 

Name  Formula  Legend 
Disk or circle circumference  Show source$L:=2~\pi\cdot R$ 

Parallelogram circumference  Show source$L:=2\cdot\left( a+ b\right)$ 

Rectangle circumference  Show source$L:=2\cdot\left( a+ b\right)$ 

Rhombus circumference  Show source$L:=4\cdot a$ 

Square circumference  Show source$L:=4\cdot a$ 

Triangle circumference (general)  Show source$L:= a+ b+ c$ 

Equilateral triangle circumference  Show source$L:=3\cdot a$ 

Isosceles triangle circumference  Show source$L:= a+2\cdot b$ 

Name  Formula  Legend 
Parallelogram area  Show source$S:= a\cdot h$ 

Parallelogram circumference  Show source$L:=2\cdot\left( a+ b\right)$ 

Name  Formula  Legend 
Rectangle area  Show source$S:= a\cdot b$ 

Rectangle circumference  Show source$L:=2\cdot\left( a+ b\right)$ 

Rectangle diagonal  Show source$d:=\sqrt{{ a}^{2}+{ b}^{2}}$ 

Rectangle area from diagonal  Show source$S:=\frac{1}{2}\cdot{ d}^{2}\cdot\sin\left( \alpha\right)$ 

Name  Formula  Legend 
Rhombus area  Show source$S:=\frac{1}{2}\cdot e\cdot f$ 

Rhombus circumference  Show source$L:=4\cdot a$ 

Name  Formula  Legend 
Square area  Show source$S:={ a}^{2}$ 

Square circumference  Show source$L:=4\cdot a$ 

Square diagonal  Show source$d:= a~\sqrt{2}$ 

Square area from diagonal  Show source$S:=\frac{{ d}^{2}}{2}$ 

Name  Formula  Legend 
Trapezoid area  Show source$S:=\frac{\left( a+ b\right)}{2}\cdot h$ 

Name  Formula  Legend 
Triangle area (general)  Show source$S:=\frac{1}{2}\cdot a\cdot h$ 

Triangle circumference (general)  Show source$L:= a+ b+ c$ 

Equilateral triangle area  Show source$S:=\frac{ a\cdot\sqrt{3}}{2}$ 

Equilateral triangle circumference  Show source$L:=3\cdot a$ 

Isosceles triangle area  Show source$S:=\frac{ b}{4}\cdot\sqrt{4~{ a}^{2}{ b}^{2}}$ 

Isosceles triangle circumference  Show source$L:= a+2\cdot b$ 

Name  Formula  Legend 
Equilateral triangle area  Show source$S:=\frac{ a\cdot\sqrt{3}}{2}$ 

Equilateral triangle circumference  Show source$L:=3\cdot a$ 

Name  Formula  Legend 
Isosceles triangle area  Show source$S:=\frac{ b}{4}\cdot\sqrt{4~{ a}^{2}{ b}^{2}}$ 

Isosceles triangle circumference  Show source$L:= a+2\cdot b$ 
