Answer:
3.5 square feet.
Explanation:
Length of the longer base, a = 4 ft
Length of the shorter base, b = 3 ft
Height of the trapezoid, h = 1 foot
[tex]\text{Area of a trapezium}=\frac{1}{2}(a+b)h[/tex]Substitute the given values:
[tex]\begin{gathered} A=\frac{1}{2}(4+3)1 \\ =\frac{1}{2}\times7 \\ =3.5ft^2 \end{gathered}[/tex]The area of the poster is 3.5 square feet.
