Answer:
A=1/2(b×h)
divide a half by 12=6
6×4,since 4 is the height=24
30 um²
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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