Answer:
1.) Circumference = 62.8mm²
2.)Circumference = 18.84dm²
Step-by-step explanation:
1.) Given: diameter = 20mm, r = 10mm
Formula: 2(pi)r
Circumference = 2(3.14)(10)
= 62.8mm²
2.)Given: r = 3dm
Formula: 2(pi)r
Circumference = 2(3.14)(3)
= 18.84dm²
