plis di jawab ya...........

tinggi =
√20² - 16²--> (21 - 5=16)
√400 - 256
√144
=12

luas trapesium =
[tex] \frac{a \: + \: b}{2} \times t = \\ \frac{5 + 21}{2} \times 12 = 156 \: cm {}^{2} [/tex]