What is the circumference of a circle with a radius of 21 cm?

What is the circumference of a circle with a radius of 21 cm?

1. 131.9 cm
2. 121.9 cm
3. 111.9 cm
4. 141.9 cm
5. Semua jawaban benar

Jawaban: A. 131.9 cm.

Dilansir dari ensiklopedia, what is the circumference of a circle with a radius of 21 cm 131.9 cm.