The area of a trapezoid, A, is the average of the lengths of the bases (B and b) multiplied by the height, h.
[tex] A = \dfrac{(B + b)h}{2} [/tex]
[tex] A = \dfrac{(3~in. + 1~in.) \times 1~in.}{2} [/tex]
[tex] A = \dfrac{4~in. \times 1~in.}{2} [/tex]
[tex] A = \dfrac{4~in.^2}{2} [/tex]
[tex] A = 2~in.^2 [/tex]
