Find the Area $90 \mathrm { ft } ^ { 2 }$

Multiple Choice

Find the area.
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(a trapezoid)

A) $90 \mathrm { ft } ^ { 2 }$
B) $36 \mathrm { ft } ^ { 2 }$
C) $45 \mathrm { ft } ^ { 2 }$
D) $23 \mathrm { ft } ^ { 2 }$