I think you'd use the pythagoran theorem for this (a squared + b squared = c squared). So 30 squared plus 22 squared equals the diagonal measure squared. This is 900 + 484 = c squared. That's 1384. The square root of that is 37.
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Step-by-step explanation:
I’m not really sure but I think the answer is 137.50.
D-10-2d+7=8+d-10-3d
-d-3=-2d-2
d-3=-2
d=1