The center is at origin O(0,0).
If it contains the point, P(-8,6), then the radius r is, by Pythagoras theorem,
r=sqrt((-8)^2+6^2)=10
The general equation of a circle at centre (xc,yc) with radius r is given by
(x-xc)^2+(y-yc)^2=r^2
Substituting r=10, (xc,yc)=(0,0)
the resulting equation is therefore
(x-0)^2+(y-0)^2=10^2
or simply
x^2+y^2=100
Answer:

Step-by-step explanation:
The circumference of a circle can be found using the following formula:

where d is the diameter. We are given the radius, so let's find the diameter.
The diameter is twice the radius.

The radius is 15 feet.

Multiply.

Now we know the diameter. Substitute 30 feet in for d.


We are using 3.14 for pi, so substitute it in.

Multiply.

The circumference of the circle is 94.2 feet.
A right angle measures an angle exactly 90 degrees, obtuse= more than 90, acute less than 90 degrees. Triangle angles add up to 180 degrees quadrilaterals measure up to 360 degrees. A fraction can be written as a decimal or percent answer. A fraction is not a whole number. The reciprocal is the opposite of that number/ fraction. Pls give brainliest.