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andrey2020 [161]
2 years ago
12

Help please and thank you

Mathematics
1 answer:
gulaghasi [49]2 years ago
3 0

Answer:

56

Step-by-step explanation:

Missing length = x + 21

Based on the Three Parallel Lines Theorem, we have:

x/21 = 20/12

Cross multiply

x*12 = 20*21

12x = 420

12x/12 = 420/12

x = 35

✅Missing length = x + 21

Plug in the value of x

= 35 + 21

= 56

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