The area of a circle with radius r is given by the formula A="pie"r^2. If a circle has area 169"pie square inches, what is the radius?
Well, the formula for area is:
A=pi*r^2
So, let’s plug in what A is:
169pi=pi*r^2
We can divide each side by pi to get rid of it:
169=r^2
r=13 or -13, depending what quadrant you’re [...]
Going to museum hop all day and need kid-friendly places for lunch and dinner.
Most of the museums have cafes, but here’s a list of other restaurants in the University Circle area. Many are in Little Italy, which would require a car unless you want to figure out the RTA schedule and pay the fares.
http://www.universitycircle.org/category-listings.aspx?cat=5§ion=visit&page=3
Mamma [...]
how do u find area of a circle using circumference for example 18.84 units is the circumference.
Divide the circumference by PI (approximately 3.14159) to get the diameter. Then divide the diameter by 2 to get the radius. Then the area is equal to PI times (radius squared). Usually stated as A [...]
For example.
The circles diameter is 30.2cm. The circles circumfrence is 94.828. How do you find the area of the circle?
You can use the fact that area of a circle is:
A = πr^2.
Note that we can use the circumference to find the radius as well. But we are already given the diameter! So who cares about [...]
Ahaha… I’m really not good at geometry. I get basic stuff, but I really don’t get this once The full problem is "Prove that the area of a circle circumscribed about a square is twice the area of the circle inscribed within the square"
Let s = the length of the side of a square.
Then the [...]
The radius of a circle I is one half the radius of circle ll. What is the ratio of the area of circle l to the area of circle ll?
Let’s say circle I has radius of 1 and circle II has a radius of 2. Find the areas:
circle I = π * 1² = π [...]
The area of the square is 196cm squared. The area of the circle is 153.94cm squared. I need to know how to calculate what fraction the area of the circle is of the area of the square.
Help ?
Calculate the square root of the area of the square.
square root of 196 = 14.
divide that by two [...]
How do you figure out the area of a circle?
If the radius is 7cm then obviously the diameter is 14cm. But I can’t remember to figure out the area of a circle. is it 7*14=98 ?
Area = πr^2
Area = 3.1416(7)^2
Area = 3.1416(49)
Area = 153.93804 sqcm
How fast is the area of a circle increasing when the circumference equals 8 feet and the circumference is increasing at a rate of 7 feet per minute? The area is increasing at ? square feet per minute.
Thanks in advance for the help!
C = 2pi*r
A = pi*(C / 2pi)^2
A = C^2 / 4pi
dA [...]
What is the diameter of a circle with an area of 81p in2?
4.5 inches
9 inches
18 inches
40.5 inches
By 81 p in2, I assume you mean 81*pi in^2
A = pi * r^2
81*pi in^2 = pi r^2
81 in^2 = r^2
Take the square root of both sides to get
9 in = r
Since the diameter is [...]
