Question

The side of an equilateral triangle is given as 8 cm, correct to the nearest centimetre. What is the least possible length of its perimeter?​

Answer 1

$\textsf {21 cm}$

$\textsf {If it is correct to the nearest centimeter, then the least side length}\\\textsf {would be 8 - 1 = 7 cm. }$

$\textsf {Then, the least possible perimeter would be :}$

$\mathsf {7 \times 3}$

$\textsf {21 cm}$