answer:
a = 28 millimeters
Explanation:
a^2 + 21^2 = 35^2
a^2 + 441 = 1225
a^2 = 784
Answer:
41
This is the formula
a^2 + b^2 = c^2
35^2 + 21^2 = 1666
√1666 = 40.81...
Maybe you can estimate it to 41.
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