Second triple
5, 12, 13
First Pythagorean triple
3, 4, 5
Third triple
8, 15, 17
Fourth triple
7, 24, 25
45-45-90
hypotenuse = root 2 x leg
30-60-90
hypotenuse = 2 x short leg
Longer leg = root 3 x short leg
Tangent
Opposite
Adjacent
Sine
Opposite
Hypotenuse
Cosine
Adjacent
Hypotenuse
Angle of elevation
Looking up at an object, the angle your line of sight makes with a horizontal line
Line of depression
Looking down, the angle your line of sight makes with a horizontal line