







Points on the xaxis 
20150314 

Justin pose la question : jamie tells her friend that ordered pairs that have an xcoordinate of O line xaxis. She used the origin as an example. Describe Janine error. Use a counterexample to explain why Janine statement is false Penny Nom lui répond. 





A region described by inequalities in cylindrical coordinates 
20150221 

Rahul pose la question : I am not able to visualize a solid given by inequalities as under (in cylindrical coordinate system)
0=
I know that (can visualize) first 2 inequalities say it is a cylinder of infinite length.
It seems that third inequality poses the restriction to the height as well as it makes us to remove a cone.
But I just can not understand it clearly.
Thanks in advance!
Regards,
Rahul Penny Nom lui répond. 





r=10cos(t) in cylindrical coordinates 
20130518 

r.m pose la question : question from calculus exam: what is the figure obtained having eqn.r=10cos(t) in cylinderical coordinates?
i know it is a cylinder with center (5,0) ,but can't the equation represent two cylinders ,one with center
(5,0) and the other with center (5,0).
thanks for any help. Penny Nom lui répond. 





Polar coordinates 
20100414 

Lan pose la question : Given the rectangular equation (x^2)+2x+(y^2)+y=0, find the polar equation. Harley Weston lui répond. 





Integration of cos (x^2+y^2) dx dy 
20100212 

anna pose la question : How do you evaluate the integration of integration of cos (x^2+y^2) dx dy? Tyler Wood lui répond. 





The line through D(4, 0) and E(2, 6) 
20091116 

Rogerson pose la question : The point F is on the line through D(4, 0) and E(2, 6) so that DF=4DE. Find the coordinates of F. Penny Nom lui répond. 





A side of a rectangle 
20090715 

hanbal pose la question : Could please help solving this problem
A(1,3) and D(5,5) are two vertices of a rectangle ABCD. The equation of line AC is 3y=4x + 5
Find
a) the equation of line DC Chris Fisher lui répond. 





Subdividing a foursided lot 
20090327 

kannan pose la question : i have a 1.5 acre land having four sides
AB=64.8 meters
BC=94.2 meters
CD=54.4 meters
DA=127.2 meters
angle at D is 90
the side AB (frontage)is road facing i want to split the plot in to two halves
having same almost area and almost equal frontage, kindly help me, if possible
explain with drawing.
Regards
Kannan Harley Weston lui répond. 





Cutting a pipe at an arbitrary angle 
20080920 

John pose la question : from the original question Al asked about cutting a 200 diameter pipe in 45 degrees. can someone explain the math steps required to creating the graph. I am trying to do the same thing only using a 150 degree cut. Harley Weston lui répond. 





A regular hexagon 
20080520 

Martin pose la question : Given a regular hexagon with center on the origin of an xy plane with coordinate (r,0) on the x axis, we are to express the coordinates of "A" located at 120 deg from (r,0) in terms of "r". Janice Cotcher lui répond. 





Three points on the circumference of a circle 
20070730 

Bharathi pose la question : given a circle with radius r and a point x,y on its circumference,output two other
points x1,y1 and x2,y2 on the circle so thar all 3 points form a equilateral triangle. Stephen La Rocque lui répond. 





What is the equation? 
20060913 

A parent pose la question : HERE ARE THE COORDINATED (0,3), (1,0), (2,3),(3,6)
WHAT IS THE EQUATION? Penny Nom lui répond. 





Plotting coordinates on a number plane 
20060908 

Victor pose la question : I need to plot coordinates (0,2), (2,2), (2,0), and (0,0) on a number or coordinates plane, I am not sure how to do this, and get lost after the first point, can you please help? Penny Nom lui répond. 





Polar to Cartesian coordinates 
20060115 

Linden pose la question : How do you convert six units at 30 degrees Polar Coordinate into a Cartesian Coordinate? Penny Nom lui répond. 





Converting coordinates 
20041025 

Allen pose la question : I am trying to help my son with his home, but I don't remember these conversions. Please help.
1. Convert the following coordinates
Cartesian x = 7, y = 24
2. Convert the following coordinates
Polar r = 4, theta = pi / 3 Penny Nom lui répond. 





A triangle in the complex plane 
20030710 

Scott pose la question : The vertices O and A of an EQUILATERAL triangle OAB in the complex plane are located at the origin and 3 + 3i. Find all possible values for the complex number representing the vertex B. Give the location of B in both polar and cartesian form (to 2.d.p) Penny Nom lui répond. 





Transformations of pattern blocks 
20030206 

Cheryl pose la question : I am trying to help my 8th grade son with Transformations  use of patttern blocks. He has to trace a figure and reflect it across the xaxis, which I can do, but then it indicates include ordered pairs  that confuses me. Penny Nom lui répond. 





Polar coordinates 
20000224 

Tran Trung pose la question : How do I convert r = 2/(2sin(theta)  3cos(theta)) to rectangular and x^{2} + y^{2} 2y = 0 to polar form? Harley Weston lui répond. 





A valentines project 
20000221 

Courtney Dohoney pose la question : I was assigned a valentines project. Our job is to make a valentines card that has a math theme. On my valentines card I would like to include the set of equations that when graphed look like a heart. If you can figure out a set of equations and get it back to me I would be very happy. Harley Weston lui répond. 





A Polar Plot 
19990506 

Irene pose la question : Consider the polar equation r=23Cos(theta/2) In the interval [o, 4Pi], how would you find the area of one of the leaves and also the length of one of the edges of a leaf? Harley Weston lui répond. 





Complex numbers/polar coordinates 
19990325 

Kate Cegelis pose la question : What is the relationship between complex numbers and polar coordinates? Harley Weston lui répond. 





Calculating the Intersection Point. 
19971210 

Milton Parsons pose la question : Given 2 lines through (x1,y1),(x2,y2),and (x3,y3),(x4,y4). Can you give me a good formula for calculating the intersection point. I would greatly appreciate it.Thanks. Chris Fisher and Penny Nom lui répond. 





A Geometry Problem 
19970918 

Rebecca Henry pose la question : A circle is centered at the vertex of the right angle of an isosceles triangle. The cirlce passes through both trisection points of the hypotenuse of the triangle. If the length of a radius of the circle is 10, find the area of the triangle. Chris Fisher Harley Weston lui répond. 

