Respuesta :

maempress

Answer:

A=1/2(b×h)

divide a half by 12=6

6×4,since 4 is the height=24

Answer:

30 um²

Step-by-step explanation:

BC = √5² - 4²

= √25 - 16

= √9

= 3 um

AC = 12 + 3 = 15 um

A = AC×BD/2

= 15×4/2

= 15×2

= 30 um²

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