Question

find the circumference and the area of a circle with radius 7 cm. use the value 3.14 for π, and do not round your answers. be sure to include the correct units in your answers.

Explanation:

Step1: Recall circumference formula

The formula for the circumference of a circle is $C = 2\pi r$.

Step2: Substitute values

Given $r = 7$ cm and $\pi=3.14$, we have $C = 2\times3.14\times7$.
$C = 43.96$ cm.

Step3: Recall area formula

The formula for the area of a circle is $A=\pi r^{2}$.

Step4: Substitute values

Substitute $r = 7$ cm and $\pi = 3.14$ into the formula: $A=3.14\times7^{2}=3.14\times49 = 153.86$ $cm^{2}$.

Answer:

Circumference: $43.96$ cm
Area: $153.86$ $cm^{2}$