Question

If two sides of a triangle have lengths a and b and if the angle between them has a measure of x, then the length, y, of the third side of the triangle can be found by using the equation y^2=a^2+b^2-2ab cos(x degrees)

If the value of x becomes less and less, what number is cos(x degrees) close to?

Answer 1

The smallest value x can have 0. So as x gets smaller and smaller, cos(x) will approach cos(0).

What is cos(0) = ?

Answer 2

1

Answer 3

Yes.

Answer 4

it is not a triangle if x = 0 :)