Answer: It is 70.
Step-by-step explanation: Once you add them all up. 15+12+7=8+5+23=70.
The length of the small missing side is 5. 12-7=5. The length of the big missing side is 23, because 15+8=23. So the answer is 70
Answer:
15 + 12 + 7 + 8 = 42
8 + 15 = 23
12 - 7 = 5
23 + 5 = 28
42 + 28 = 70 mm
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