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Nov
16
comment How to select three points $A$, $B$, $C$ from the following list so that the circle passing $A$, $B$, $C$ has centre $(1,2,3)$?
@SjoerdC.deVries Please check my code. Am I wrong? I want to choose the triangles aree not right triangle.
Nov
16
comment How to select three points $A$, $B$, $C$ from the following list so that the circle passing $A$, $B$, $C$ has centre $(1,2,3)$?
@belisarus You wrote Flatten[tt, 1], {3}]. What is the tt?
Nov
15
revised How to select three points $A$, $B$, $C$ from the following list so that the circle passing $A$, $B$, $C$ has centre $(1,2,3)$?
edited body
Nov
15
comment How to select three points $A$, $B$, $C$ from the following list so that the circle passing $A$, $B$, $C$ has centre $(1,2,3)$?
You are wrong. For example three points (-3, -2, 1), (-3, -2, 5) and (-3, 0, -1) has centre (-3,2,3).
Nov
15
asked How to select three points $A$, $B$, $C$ from the following list so that the circle passing $A$, $B$, $C$ has centre $(1,2,3)$?
Oct
29
comment How to find the domain and range of an implicit function?
Perhalf it is wrong with the function f[x_] := (x^2 + x + 1) (x^2 + x + 2)
Oct
13
answered Heron's formula for area of a triangle
Oct
13
comment Heron's formula for area of a triangle
I used a = {-1, 0}; b = {1, 0}; c = {0, 1}; s = 1/2 Abs[Det[{a - b, a - c}]]
Oct
10
comment How can I get the exact solution of this equation (inequality equation)?
I think, Thread[Power[Sqrt[8 16^x - 1/2 9^x] == 3 4^x - 3^x, 2], Equal]; Reduce[{%, 3 4^x - 3^x >= 0} , x, Reals] // Simplify
Oct
10
accepted How can I get the exact solution of this equation (inequality equation)?
Oct
10
revised How can I get the exact solution of this equation (inequality equation)?
added 234 characters in body
Oct
10
asked How can I get the exact solution of this equation (inequality equation)?
Oct
5
comment Find the value of parameter so that the equation has one solution
@Michel E2 If I want to the equation $x^4+2(m+1)x^2 - m - 4 =0$ has three reals solutions. How can I get it?
Oct
3
accepted How to get a list of pairs into the form $(x,y)$?
Oct
3
comment How to get a list of pairs into the form $(x,y)$?
In my country, the pair of solution must be formated like that. After Mathematica out put, I use TeXform to convert them.
Oct
3
asked How to get a list of pairs into the form $(x,y)$?
Sep
26
comment How to choose three points on the circle so that the triangle is not a right triangle?
Thank you very much.
Sep
25
comment How to choose three points on the circle so that the triangle is not a right triangle?
@SjoerdC.deVries, You said "The remaining 24 have a right angle, just put a Not in front of the FreeQ above to find them". I dont know how to put the FreeQ. Please write for me that command. Thank you.
Sep
23
revised Is there a triangle like this?
added 141 characters in body
Sep
17
revised Is there a triangle like this?
added 350 characters in body