Best Answer

The general equation for the area of a circle is π*r2, where r is the radius of the circle, and π is pi, which is approximately 3.14159. The diameter of a circle is how far it is from one side of the circle to the other, and the radius is how far it is the from edge to the center, thus the radius is half the diameter. Therefore the area is π*(92) ~ 254.47

User Avatar

Wiki User

โˆ™ 2010-03-18 23:16:27
This answer is:
User Avatar
Study guides


20 cards

A polynomial of degree zero is a constant term

The grouping method of factoring can still be used when only some of the terms share a common factor A True B False

The sum or difference of p and q is the of the x-term in the trinomial

A number a power of a variable or a product of the two is a monomial while a polynomial is the of monomials

See all cards
1986 Reviews

Add your answer:

Earn +20 pts
Q: The diameter equals 18cm how do I find the area?
Write your answer...
Still have questions?
magnify glass
Related questions

Find the area of a parallelogram with height 18cm and base length 5cm?


How do measure the area and perimiter of circle?

OK, SO to find the area of a circle, you find the radius (half of the diameter), and fit it into the equation πr2=A where r equals radius and A = area. The perimeter of a circle is π multiplied by the diameter. π is ≈ 3.1415296.

Find the Lateral Area of a cylinder with diameter of 12 cm and a height of 20 cm?

The Lateral Area of a cylinder with diameter of 12 cm and a height of 20 cm is equivalent to 0.075 square meter. Diameter of 12 cm is equals to 0.06 meter in radius and height of 20cm is equals to 0.2 meter

How do I figure the area of a circle by diameter?

To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)

How do you find radius if you have the circumference or diameter or area?

circumfrence: divide it by π (3.14). Diameter: divide by 2. area: find diameter and divide by 2.

How do you find diameter of a circle with the area of 58.69?

Diameter is 8.64444

How to find the area of a circle?

Circumference= 3.14 x Diameter Area of circle= 3.14 x diameter x diameter

Find the surface area of a cylinder with d equals 12 in h equals 14 in?

Total surface area including the two end pieces: (2*pi*radius2) + (pi*diameter*height) Area = 240*pi square inches

How do you find the diameter of a circle in the terms of pi?

To find the diameter of a circle, you will either need to know the area or its circumference. If you know the area: diameter = 2 x squareroot(area / Pi) If you know the circumference diameter = circumference / Pi

How do you find the area using the diameter?

I assume that you are referring to the area of a circle. You divide the diameter in half to find the radius and then you put it into the formula.

People also asked