Answer
$T=25$ square cm.
Work Step by Step
The area of this figure can be calculated as the sum of the rectangle and the triangle on the top.
$T=T_1+T_2$
Rectangle:
$T_1=a\times b$
$T_17\times 3=21$ square cm.
Triangle:
$h\times \frac{a}{2}=2\times \frac{7-2\times1\frac{1}{2}}{2}=7-3=4$ square cm
$T=T_1+T_2=21+4=25$ square cm.