72.7k views
1 vote
?cm

13 cm
Calculate the
circumference.
Formula:
C = 2fr
Use 3.14 for n.
USE A
C = [?] cm
Round to the
nearest tenth.

?cm 13 cm Calculate the circumference. Formula: C = 2fr Use 3.14 for n. USE A C = [?] cm-example-1
User Tricertops
by
7.8k points

1 Answer

4 votes

Use the formula on-screen. r means radius, and π is pi, which the question tells you to approximate as 3.14. The radius is 13cm. The formula is 2πr, so multiply 2 by 3.14 by r. 2 x 3.14 x 13 = 81.64. To round to the nearest tenth, look at the hundredths digit. It is 4, and 4 < 5, so you round down. 81.64 rounded to the nearest tenth is 81.6. Don't forget units.

Answer: 81.6cm

User Fordy
by
7.9k points

No related questions found