Question

The diameter of a circle is 10 cm. Find its area in terms of π.

Answer 1

Answer:

A = 25$\pi$ $cm^{2}$ or A = 78.54 $cm^{2}$

Step-by-step explanation:

The diameter of a circle is just the radius two times, in this case, the diameter is 10. This means that the radius would be 5. Therefore we can use 5 as our r variable in the formula for area (A=$\pi r^{2}$),

A = $\pi 5^{2}$, simplify $5^{2}$:

A = 25$\pi$

From here you can leave the asnwer in its excat form, 25$\pi$, or you can simplify it by multiply 25 times pi to get 78.54 (rounded to the hundreths place).

Answer 2

Answer:

7.9577cm^2

Step-by-step explanation:

10 = 2 * r * pi

==> r = 5/pi

area = r * r * pi = 25/pi = 7.9577cm^2