I have a rather simple question, not sure if this is in the right SO.
I am attempting to find the angle of a side of a right angle triangle. And also attempting to find the mid point of a right angle triangle no matter the rotation(for a webapp I am making). I am attempting to find the angle where the question mark is, then test that my algorithm/methodology to find the position of the mid point of a shape works(this is for my HTML5 Canvas Web App).
Is my maths correct?...
// This is half code/mathematics ? = tan-1( opposite/adjacent ); // inverse tan ? = tan-1(50/25); ? = 63.43; // is that correct??
My math algorithm below attempts to find the mid point when a shape is rotated. In my webapp I will only ever know the x,y pos & the width & height, but it will also be rotated around the x,y point which means the midpoint can be different. Is it correct?
// To find the x,y midpoint all I have to do is have // the hypotenuse of the triangle & the angle of one // side(the angle I found above). Is that correct? // h stands for hypotenuse, a stands for the angle I found above midX = cos(a)*h midY = sin(a)*h // so to take the example above, if I use those formulas I should get an mid x,y value of 25,12.5 midX = cos(63.4)*75; = 33.58; // shouldn't this be 25? midY = sin(63.4)*75; = 67.06; // should be 12.5?