Formulas: Area and Perimeter
1) Square:
$A=\color{red}{a}\cdot\color{red}{a}$
$P=4\cdot \color{red}{a}$
$A=\color{red}{a}\cdot\color{red}{a}$
$P=4\cdot \color{red}{a}$
2) Rectangle:
$A=\color{red}{a}\cdot \color{blue}{b}$
$P=2\cdot (\color{red}{a}+\color{blue}{b})$
$A=\color{red}{a}\cdot \color{blue}{b}$
$P=2\cdot (\color{red}{a}+\color{blue}{b})$
3) Triangle:
$A=\frac{ 1 }{ 2 } \cdot\color{red}{g}\cdot \color{gray}{h}$
$P=\color{red}{a}+\color{blue}{b}+\color{orange}{c}$
$A=\frac{ 1 }{ 2 } \cdot\color{red}{g}\cdot \color{gray}{h}$
$P=\color{red}{a}+\color{blue}{b}+\color{orange}{c}$
4) Parallelogram:
$A=\color{red}{g}\cdot \color{gray}{h}$
$P=2\cdot (\color{red}{a}+\color{blue}{b})$
$A=\color{red}{g}\cdot \color{gray}{h}$
$P=2\cdot (\color{red}{a}+\color{blue}{b})$
5) Trapezoid:
$A=\frac{ 1 }{ 2 } \cdot(\color{red}{a}+\color{brown}{c})\cdot \color{gray}{h}$
$P=\color{red}{a}+\color{blue}{b}+\color{orange}{c}+\color{purple}{d}$
$A=\frac{ 1 }{ 2 } \cdot(\color{red}{a}+\color{brown}{c})\cdot \color{gray}{h}$
$P=\color{red}{a}+\color{blue}{b}+\color{orange}{c}+\color{purple}{d}$
6) Circle:
$A=\pi \cdot\color{red}{r}^{ 2 }$
$P=2\cdot \pi \cdot\color{red}{r}$
$A=\pi \cdot\color{red}{r}^{ 2 }$
$P=2\cdot \pi \cdot\color{red}{r}$