Respuesta :

zack28030

Answer:399

Step-by-step explanation:

((a+b)/2) * h

((13+25)/2) * 21

399

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VickyLiu
Answer: 399 cm^2

The formula is: (Top + Bottom)(height)/2

Therefore:
(13 + 25)(21)/2
= (38)(21)/2
= 798/2
= 399