Find the area and circumference of a circle
with a diameter of 15 cm.

Step-by-step explanation:

To find the area the formula for area of a circle can be used:

However we aren't given r, which stands for the radius. However we have diameter, which is just 2 times r. If we use this knowledge we can know that:

Now we can plug in r into the area formula to find the area.

For diameter the formula is:

So plugging in diameter we get:

i think it's ф or x=6,-6

step-by-step explanation:

-x^2=-36

x^2=-36

ф

or

if you mean by : -(x^2)=-36

it'll be: x^2=36

x=6,x=-6

hope it'll ! have a good day!

you for asking!