Question

Helen draws a random circle
she then measures its diameter and circumference

she gets a circumference, c of 405mm to 3 significant figures
she gets a diameter d of 130 mm to 2 significant figures

helen wants to find out the value of π using π = c/d

calculate the lower bound and upper bound for helens value for π
give your answers correct to 3 decimal places

Answer 1

Answer:

21 square /0.219 (5 s.f)

I hope it may be