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seen 11 hours ago

Dec
12
asked How to convert this answer into $\ln$ form?
Dec
11
accepted How to solve this combination equation?
Dec
10
awarded  Popular Question
Nov
19
accepted How to select three points $A$, $B$, $C$ from the following list so that the circle passing $A$, $B$, $C$ has centre $(1,2,3)$?
Nov
18
comment How to select three points $A$, $B$, $C$ from the following list so that the circle passing $A$, $B$, $C$ has centre $(1,2,3)$?
let us continue this discussion in chat
Nov
17
comment How to select three points $A$, $B$, $C$ from the following list so that the circle passing $A$, $B$, $C$ has centre $(1,2,3)$?
I want the triangle ABC is not a right triangle. But with three vertices {{-3, -2, 1}, {-3, -2, 5}, {5, 6, 1}}, this is a right triangle. where is wrong in my code?
Nov
17
comment How to select three points $A$, $B$, $C$ from the following list so that the circle passing $A$, $B$, $C$ has centre $(1,2,3)$?
Maybe my Pick[...] is wrong. Please help me.
Nov
17
comment How to select three points $A$, $B$, $C$ from the following list so that the circle passing $A$, $B$, $C$ has centre $(1,2,3)$?
For example {-3, 4, -1}, {-1, 6, 7}, {3, 6, 7}
Nov
17
comment How to select three points $A$, $B$, $C$ from the following list so that the circle passing $A$, $B$, $C$ has centre $(1,2,3)$?
@DanielLichtblau I can not. Please help me.
Nov
17
comment How to select three points $A$, $B$, $C$ from the following list so that the circle passing $A$, $B$, $C$ has centre $(1,2,3)$?
I check some circle. It's wrong. That is mean center not at $(1,2,3).
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)?