We present the formula to calculate the areas of various geometric shapes, with graphical explanations.
 shape representation Area square $a^2$ rectangle $a\times b$ right triangle $\displaystyle\frac{a\times b}{2}$ Check the explanations triangle $\displaystyle\frac{a\times b}{2}$ Check the explanations parallelogram $a\times b$ Check the explanations trapezoid $\displaystyle b\times\frac{a+c}{2}$ Check the explanations