Uncle Li wanted to check whether the AD side and BC side on the front of the sculpture base were perpendicular to the bottom AB, but he only brought a tape measure.

Very reasonable, but the actual error is relatively large:

Pythagorean theorem tells us that the sum of the squares of two right angles of a right triangle is equal to the square of the hypotenuse.

It also tells us that "three strands, four strings and five", that is, the ratio of twisted strings is 3: 4: 5.

Then, we can know whether the "right angle" is vertical by measuring the length of 3 cm and 4 cm on both sides of an angle with a ruler of 20 cm, and then measuring whether the hypotenuse is 5 cm.

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Healing is good night. Talk about your mood: happiness is actually very simple. Don't be unhappy yourself.