What best explains whether a triangle with side lenghts 5 cm, 13 cm, and 12 cm is a right triangle?

You can get help from Pythagoras theorem:

hope this helps

Rounding decimals is very similar to rounding other numbers. if the hundredths and thousandths places of a decimal is forty-nine or less, they are dropped and the tenths place does not change. for example, rounding 0.843 to the nearest tenth would give 0.8. , your welcome !