Math Is Fun Forum

emmakatecumbo

Member

Registered: 2017-09-22

Posts: 35

Geometry homework

I need help, I have the answers to every one of the questions but my teacher is asking for the work as well, My dad helped me with everything but he is out of town, so i have no idea how to do the work and I need it done soon, could someone please help show the work for the problems I have answered. I would greatly appreciate it

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

1.  4
16*pi
 
2. SQRT(3)
3*pi
 
3. 7
49*pi
 
4. 6x
36 x^2 * pi
 
5. 10
100*pi
 
What is the radius if the area of the circle is:

6. 9(PI)
3
 
7. 4x^2(PI)
2x
 
8. 25(PI)
5
 
9. 81(PI)
9
 
10. 5(PI)
sqrt 5
 
11. (9/16)PI
3/4
 
12. 25y^2(PI)
5y
 
13. 16z^2(PI)
4z
 
14. t^2(PI)
t
 
15. t^2(PI)
1
 
 
What is the area of the sector if the radius is 6 and the degree measure is:

16. 26
2.68*pi = 9.523
 
17. 30
3*pi
 
18. 50
5*pi
 
19. 90
9*pi
 
20. 120
12*pi

Monox D. I-Fly

Member

From: Indonesia

Registered: 2015-12-02

Posts: 2,000

Re: Geometry homework

For 1 - 5, area = pi*(radius^2). Now show us your work for those numbers first.

---

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,621

Re: Geometry homework

hi emmakatecumbo

Those answers look good to me so I don't quite understand why your teacher wants more.  If the questions required a long answer, then it's not unusual for a lot of working to be required but these only take a line anyway.  There's a story (which probably isn't true) that  a Cambridge undergraduate was awarded a 'first' for a one line answer in the final exam because it was a new and potentially genius way of doing the problem.

Here's a model answer giving all the steps:

In your area of squares and rectangle questions:

Hope that helps,

Bob

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob