Use=3.14,round off answer to nearest two decimal place and write correct unit of measure.? 7cm,18cm.?

The circumference of a circle is calculated using the formula C = 2πr, where r is the radius of the circle.

For the first circle with a radius of 7cm:
C = 2 * 3.14 * 7
C = 43.96 cm

For the second circle with a radius of 18cm:
C = 2 * 3.14 * 18
C = 113.04 cm

Therefore, the circumferences of the circles are 43.96 cm and 113.04 cm, respectively.

The formula for the circumference of a circle is:

C = 2πr

where:

C is the circumference of the circle
π is a mathematical constant approximately equal to 3.14159
r is the radius of the circle

Given:

r = 7 cm (radius of the smaller circle)
r = 18 cm (radius of the larger circle)

Calculate the circumference of the smaller circle:

C = 2πr
C = 2 × 3.14 × 7 cm
C ≈ 43.96 cm

Calculate the circumference of the larger circle:

C = 2πr
C = 2 × 3.14 × 18 cm
C ≈ 113.04 cm

Therefore, the circumferences of the smaller and larger circles are approximately 43.96 cm and 113.04 cm, respectively.