ðŸ’¯ Maths

ðŸ’¯ Maths# Helen draws a random circle. She then measures it's diameter and circumference. She gets a circumference, (c), of 405 mm correct to 3 significant figures she gets a diameter, (d), of 130 mm correct to 2 significant figures. Helen wants to find the of value Pi using the formula pi= C/D. Calculate the lower bound and upper bound for Helen's value of Pi. Give your answer correct to 3 decimal place.
Help please!?