Posted by **Marisa** on Tuesday, June 15, 2010 at 3:49pm.

What is the radius if the area of the circle is:

4x^2(PI)

My answer 4x^2(pi)=(pi)(r)(2), 16x(pi)=(pi)(r)(2), 16x/pi=5x.

5(PI)

My answer 5(pi)=(pi)(r)(2), sqare root of 5 is 2.23, which rounds to 3, 3(pi)=square root of 9.

What is the area of the sector if the radius is 6 and the degree measure is:

30

My answer 30/360(pi)(6)^2, 0.83(pi)(36),rounds to 1(pi).

50

My answer 50/360[(pi)6^2], 7.1/72[(pi)36], 7.1(36), 255/3.14, =81, square root of 81=9*pi.

90

My answer 90/360[(pi)6^2] 9.49/72[(pi)(36)], 18/9=2*pi.

120

My answer 120/360[(pi)6^2], 4/72[(pi)(36)] 4(36)=144, square root of 144=12*pi.

These are the question and answers that were incorrect on my assignment. I am unsure of what I did incorrect. I would be grateful for assistance. Cheers!

Sincerely,

Marisa

## Answer this Question

## Related Questions

- Algebra - 69: 16x^2+8x-3. I inserted this into the quadratic formula and got -8...
- Math - 1. Rosa, Roberto, Andrea, and Inno find an estimate for square root 10. ...
- Algebra check? - Sorry the first post formatted weirdly. 1. 3i - 10 --------- 8i...
- algebra - Solve the system by addition or substitution. 16x-4y=20 y=4x-4 I ask ...
- Algebra - Can you tell me if my answers are correct for these problems? 1. 3i - ...
- Math - find any stationary points of the function g(x) = (2x-3)square root of 5+...
- algebra - 1)Simplify:(6x^3-16x^2+11x-5)/(3x-2) answer= 2x^2-4x+1-3over3x-2 2)...
- Math - What are the solution sets of the following 3 problems,the square root of...
- Pre Calculus - Find the roots of the function g(x)=x^3 +16x a)0,4i, -4i b)0,-4,-...
- Math ~CHECK MY ANSWER~ - 1) Which of these is a rational number? a. Pi b. Square...