# The sides of a triangle are 5.2 cm, 6.3 cm and 9.4 cm, each correct to the nearest millimetre. Calculate the lower bound of the perimeter of the triangle

The sides of a triangle are 5.2 cm, 6.3 cm and 9.4 cm, each correct to the nearest millimetre. Calculate the lower bound of the perimeter of the triangle
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Aubree Mcintyre
Because each side length is correct to the nearest millimetre, at most they could be one millimetre less than the given numbers. That is, 5.1 cm, 6.2 cm and 9.3 cm. So the lower bound of the perimeter is
5.1+6.2+9.3=20.6 cm