Charlie measured the circle-shaped part of a sun his sister drew on the chalkboard.

The circumference of the circle is 94.2 cm. What is the diameter? (Use 3.14 for pi)

30 cm

Step-by-step explanation:

The circumference (C) and diameter (d) are related by ...

... C = π·d

Then the diameter can be found from the circumference by dividing by π:

... C/π = d

... (94.2 cm) / 3.14 = 30 cm

The diameter of Charlie's sister's sun is 30 cm.