lohataiwan.blogg.se - Area of circle formula

Nick Irwin, would like me to mention, for the sake of completeness, that the circumference of the pizza is pi times the diameter. Results: From a purely mathematical point of view, the special with two large pizzas is a slightly better deal, pricing the pizza at 4.97 cents per square inch.Īdditional Details: My eight-grade math teacher, Mr. In column H, calculate the dollars per square inch of pizza, using =G2/F2.

Enter the cost for the special in column G.

Calculate the total square inches in column F by using =E2*D2.

In column E, enter the quantity of pizzas.

What is a radius Its the distance from the center of. Area PI r r, where PI is a constant and r is the radius of the circle.

In cell D2, calculate the area of the pizza in square inches, using =PI()*C2^2. The area of a circle is given by the following formula: Ar2 where r is the radius of the circle. The formula for calculating area of a circle is.

In cell C2, calculate the radius as =B2/2.

In cell B2, enter the diameter of the pizza.

The unit of area is the square unit, for example, m2, cm2, in2, etc. You can also see at the bottom of the calculator, the step-by-step solution. To calculate the area, you just need to enter a positive numeric value in one of the 3 fields of the calculator. Here's how you determine which is the better pizza deal: The formula for the area of a circle is A r2, where r is the radius of the circle. 4870.11 square inches (in) Use the this circle area calculator below to find the area of a circle given its radius, or other parameters. =PI() returns the value of pi to 15-digit precision.It is a lot easier to remember =PI() than the many digits in 3.141592654. Excel offers the PI function to return this number. Pi is a Greek letter that represents 3.141592654. If you enter the diameter of the pizza in B2, the radius is =B2/2. Substituting the value of into the formula, approximately 3.1416, and evaluating the multiplication gives the area of the circle. For example, to find the area of a circle with a radius of length 5 the formula is: A (5)2. The radius of a pizza is one-half the diameter. The area of a circle is given by the constant (pi) multiplied by the radius of the circle squared. The formula for the area of a circle is pi * r 2 (where r is the radius). Strategy: You will have to figure out the area of a 12" pizza vs. The area of a circle is A pi multiplied with r and the circumference is U 2 multiplied with pi. I can buy three medium (12") pizzas for $18 or two large (16") pizzas for $20. The following formulas are used for circle calculations. Mathematicians know that the exact area of a circle is actually closer to 3.14r 2 and since π = 3.14 the formula for finding the area of a circle is written as πr 2.Problem: I need to order pizza for my department's staff meeting.We know that the area of the square is 4r 2 and as it turns out the area of the circle is about 3r 2. The circle is slightly smaller than the large square so the area of the circle is less than the area of the large square.

Since the 4 small squares are the same size as the 1 large square, the area of the large square is also equal to 4r 2.

The total area of the 4 small squares, therefore, equals 4r 2. Now we have 4 small squares and each small square has an area of 1r 2.

Let's draw some more radii (plural of radius).

For a moment think of the area of the small square as 1r 2. In the case of our small square the area is r times r, which simplifies to r 2.

The area of the small square is r 2 since the equation for the area of a square is length times width.The lengths of each side of the small square equal r. The formula for the area of the semi-circle is as follows, A. Notice that a small square is now formed. The formula for the area of the circle is as follows, A r² A is an area of the circle is the mathematical constant The approximate value of pi is 3.14 or 22/7 r is the radius of the circle Area of Semi-Circle: The area of the semicircle is the region covered by the 2D figure. Notice the circle which fits perfectly inside the big square.

Have you ever wondered why the equation of a circle is A = πr 2 ? How the Equation for the Area of a Circle is Derived