Tutors Answer Your Questions about Circles (FREE)
Question 113209: Homework questions: The area of a circle is found by the equation A=pie*r^2. If the area A of a certain circle is 81pie square centimeters, find its radius r. I need to know how to figure this to be able to get the answer.
Click here to see answer by Earlsdon(6294)  |
Question 113209: Homework questions: The area of a circle is found by the equation A=pie*r^2. If the area A of a certain circle is 81pie square centimeters, find its radius r. I need to know how to figure this to be able to get the answer.
Click here to see answer by solver91311(17077)  |
Question 113212: Homework question: A circular pool measures 14 feet across. One cubic yard of concrete is to be used to create a circular border of uniform width around the pool. If the border is to have a dept of 1 inch, how wide will the border be? Use 3.14 to approximate pie. Express your solution rounded to two decimal places. (1 cubic yard=27cubic feet)I would like to see how this is worked out, not just get an answer. Thank you!
Click here to see answer by solver91311(17077) |
Question 117909: I need to find the general form of the equation of a circle. The problem in the book is "find center at the point (-3,1) and tangent to the y-axis. Im taking a correspondence course and am having difficulty with the tangent part of the problem. Cheers!
Click here to see answer by Earlsdon(6294) |
Question 118674: A goat is tethered in the middle of a grass field on a rope of length 3.7m.
a State the shape of the area the goat can graze
Circle
b Calculate the size of the grazing area (giving your answer correct to 2 decimal places)
Area = 3.142 x radius2
Area = 3.142 x 3.7
Area = 11.6254
Area = 11.63 [rounded to 2 decimal points]
c Give another example of when you might need to use _ (pi).
d Identify an activity to support your understanding of _ (pi).
Is answer to question a and b correct and can you please help me to solve the next two please.
Click here to see answer by stanbon(57967) |
Question 120263: Can some one show me how to find a circumference of a circle?
Can some one show me how to find a area of a circle?
One of my question says find the circumference of a circle that has a radius of 4 cm?
The second question says find the area of a circle that has a radius of 4 cm?
Thanks so much for all the help!!!!
Click here to see answer by stanbon(57967) |
Question 122054: I managed to do 7,8 :D just now, something clicked :D
But, question 9, IMPOSSIBLE :P im so awful haha! :D
Find the equation of the circles passing through these sets of points.
a ( 5,0), (3,4) and ( -5,0)
b. (6,3), (-5,2) and (7,2)
c. (2,0), (3,1) and (-6,10)
if some one could help me with those three, id actually be so amazingly happy :D
ill forget the rest :P this is just like the hardest thing ive done :D :( please help :D
Click here to see answer by solver91311(17077) |
Question 122053: Hey :D
i attemped this geometry based homework 2 weeks ago, i managed to do questions 1,2,3,4,5,6,
which i found challenging as circles arent my strong point :D i tried for twice to do questions 7,8,9.
With no luck, it has driven me actually crazy, ive tried so hard, and when i got it back earlier today he said, try again.
So i would really appreciate if someone could help me on these 3 questions, i have a headache from them now, i just wanna know how to do them :(
7.
Find the equation of the circle whose centre is (3, -5) and which passes through the point (6, -7).
( i thought i was really getting somewhere with this question, i think just a small thing i must have done wrong somewhere).
8.
The points (10, -4) and (2,2) are the ends of a diameter of a circle, find the equation of the circle?
I went along the lines of finding the radius by halving... etc, again, something i think only small occured wrong.
9. ( this i cant do at all)
they give 3 points on a circle and must find the equation from only 3 points in a circle.
I have NO idea in the world how to do this, please help :D
a circle passes through the points (6,3), (-5,2) and (7,2) , find the equation of the circle.
Thank you SO much for anyhelp, im sorry for asking so much, but ive tried 2 days, tried really hard to understand it, read textbooks and internet pages :( Im sorry but i really need help thanks you SO much!
Click here to see answer by scott8148(6628)  |
Question 123338: Ace Carpentry needs to cut an arch for the top of an entranceway. The arch needs to be 8 ft. wide and 2 ft. high. To draw the arch, the carpenters will use a stretched string with chalk attached at an end as a compass.
In the picture the top of the arch is point (0,2). The sides of the arch are (4,0) and (-4,0).
A) Using coordinate system, locate the center of the circle.
I tried to do the midpoint formula but couldn't figure the center using that and not with the distance, unless I am doing it all wrong.
B)What radius should the carpenters use to draw the arch?
Click here to see answer by solver91311(17077) |
Question 125172: This problem is from a practice exam:
A circle has its center somewhere along the line y=3. It passes through the points (8,11) and (-4,-5). Find its equation.
-I think the first step is for me to find the radius. Because I know the equation of a circle is  . But I don't really know how to find the radius when I don't know the exact center.
Click here to see answer by stanbon(57967) |
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