geometry formulas for area and perimeter of shapes

Right triangle

circle area and perimeter formula
$$\textbf{Pytagoras}$$
$$a^2 + b^2 = c^2$$
$$Sin(A)=\frac{a}{c}$$
$$Cos(A)=\frac{b}{c}$$
$$Tan(A)=\frac{a}{b}$$
$$Cot(A)=\frac{b}{a}$$
$$$$