Two legs of a right triangle are 2 and the square root of 5. Let angle Abe the smallest angle of triangle ABC. What is cos A?
let's find the hypotenuse first.
By Pythagoras' Theorem:
where is the length of the hypotenuse
Now the smallest angle will be opposite the smallest side, that means it will be adjacent to the longest side (other than the hypotenuse). that means is the anjacent side to