Thursday

July 24, 2014

July 24, 2014

Posted by **alaina** on Monday, January 7, 2008 at 4:16pm.

1. r=14ft

2.d=3 1/3 yd

- Math -
**Damon**, Monday, January 7, 2008 at 4:32pmA = pi r^2

A = (22/7)(14)^2 , you do arithmetic

answer in square feet (ft^2)

in the second one r = D/2

so r = (1/2)(10/3) = 5/3 yard

so

A = pi r^2

A = (22/7)(25/9) you do arithmetic

in square yards (yd^2)

- Math -
**Ms. Sue**, Monday, January 7, 2008 at 4:36pmThe formula for the area of a circle is A = pi*r^2

1.

A = 22/7 * 14 * 14

A = ?

2. In this problem, you need to find the radius -- which is 1/2 of the diameter.

A = 22/7 * 1 2/3 * 1 2/3

A = ?

If you post your answers, we'll be glad to check them.

- Math -
**Guido**, Monday, January 7, 2008 at 5:45pmYou were given two questions:

Find the area of each circle use 22/7 for pie.

1. r=14ft

2.d=3 1/3 yd

First of all, it's not pie; it's pi.

Pie is something we eat; pi is an irrational number. The symbol for pi is ð.

The area of a circle formula is:

Area = pi times radius squared, which is written A = ð(r)^2.

We are looking for A, where A represents the area of the circle.

A = ð(14ft)^2

A = (22/7)(14ft)^2

A = 616 ft^2....This is read: "616 square feet." Why square feet? Area is measured in square units.

==================================

For the second question, you were given the diameter as a mixed number.

Your diameter is 3_1/3, which I will write as an improper fraction (10/3).

We need the radius in order to plug it into the area formula as given above.

The radius is 1/2 of the diameter.

So, (10/3) times (1/2) = (5/3)

The fraction (5/3) is our radius here.

We now plug (5/3) for r in the formula for the area of a circle and simplify.

A = ð(r)^2

A = (22/7)(5/3)^2

A = (22/7)(25/9)

A = 550 yards^2...This is read: "550 square yards.

That's it!

**Related Questions**

Algebra - The Circumference and area of a circle of radius r are givin by 2 [pie...

Math - A mechanical engineering student wishes to inscribe a rectangle in a ...

8th grade math - The radius of circle M is 3 times the radius of circle P. If ...

math 5th - Estimate teh area of the circle and use 22/7 for pie. Teh circle ...

calculus - find the area of each circle. use 22 over 7 for pie. and radis for 15...

Math - Find the rate of change of the area of a circle when its radius is 18.0 m...

8th grade math - circle A has a raduis that is twice the length og the raduis of...

geometry - how do you find the circumference of a circle with the area of 169 ...

Math - The radius of a circle is decreasing at a constant rate of 0.1 ...

maths - 1. Prove using mathematical induction that 1+2+3+...+n=[ n(n+1)]/2 2. ...