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37.2 cm
Method:
The two sides of your screen and the diagonal form a right angled triangle. So you can use trigonometry to solve the problem. One of the trigonometry rules is Pythagoras Theorem, which says;
h2 = a2 + b2
Where h is the length of the diagonal (or "hypotenuse"), and a and b are the lengths of the other 2 sides.
So we have;
h2 = 302 + 222 = 1384
h = square root of 1384 = 37.2 cm
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