The shape above is a trapezium, so we are going to use the formula for the area of a trapezium which is,
[tex]area = (\frac{a + b}{2} )h[/tex]
Plugging in our values,
[tex]area = ( \frac{2 + 8}{2} ) \times 3 = ( \frac{10}{2} ) \times 3 = 5 \times 3 = 15 {cm}^{2} [/tex]
So the area will be
[tex]15 {cm}^{2} [/tex]
