given an angle and two coordinates of a triangle;;; how to find the third coordinate?

Answer 1

You can't.

The two coordinates define one line, one side of the triangle. You also have an angle. That's two pieces of information.

Defining a triangle takes three pieces of information. Each can be a length or an angle in any combination, but you've got to have three. (All three coordinates would work too.)

I'll bet that doesn't feel any better. Sorry. :)

Answer 2

Find the third coordinates, when two coordinates are known.

There are three angles to a triangle

Angle A, B and C.

Let angle A coordinates (x₁, y₁) = (2, 4)

Let angle B coordinates (x₂, y₂) = (6, 8)

Angle C coordinates (x₂, y₁)

x₂= 6, y₁= 4

The third coordinates becomes (6, 4)

- - - - - - - - - -s-

Answer 3

Adam is right. You can't. You need to know the length of two lines and an angle. Two coordinates only give you one line, which is insufficient information.

Answer 4

Use pythagoras theorem
Draw a triangle place the coordinate
Use a^ 2 = b^ 2 +c^ 2
or using sin, cos, tan
Check link http://www.cut-the-knot.org/pythagoras/index.shtml