Formulas

The following formulas can be used to find the area A of some common polygons:

Area of a square	A = s[latex]^2[/latex]	s: length of one side
Area of a rhombus	A = [latex]\frac {d\space ×\space D}{2}[/latex]	d: length of the shorter diagonal D: length of the longer diagonal
Area of a parallelogram	A = b × h	b: base h: height
Area of rectangle	A = b × h	b: base h: height
Area of a triangle	A = [latex]\frac{b\space ×\space{h}}{2}[/latex]	b: base h: height
Area of a trapezoid	A = [latex]\frac{(b\space+\space{B})\space×\space{h}}{2}[/latex]	b: shorter base B: longer base h: height
Area of a regular convex polygon	A = [latex]\frac{a\space×\space{P}}{2}[/latex]	s: length of a side a: slant height n: number of sides P: perimeter (P = ns)