Answer:
24 mm2
Step-by-step explanation:
The are of the small triangle is:
1/2 * 3 * 4 = 6 mm2
The area of the large triangle is:
1/2 *(6+4+2) * 5 = 30 mm2
Subtract the are of the small one from the larger one:
30 - 6= 24 mm2
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