Mathematics for IGCSE & O level - Limits Of Accuracy (Section 1 - No. 45)
A triangle has sides of length 7 cm, 8 cm and 10 cm. All measurements are correct to the nearest centimetre. What is the lower bound of the perimeter of the triangle?
24 cm
24.0 cm
24.4 cm
24.5 cm
Explanation
The lower bounds are 6.5 cm, 7.5 cm, and 9.5 cm. The lower bound of the perimeter is 6.5 + 7.5 + 9.5 = 23.5, or 24cm