How do I figure angles in a right triangle.?

You can use:

x being the angle

tan x = opposite/adjacent

tan x = 2/5

x = arctan(2/5)

x = 21.8

for the hypotenuse, Pythagorean Theorem:

a^2 + b^2 = c^2

In your case:

2^2 + 5^2 = c^2

4+25=c^2

sqrt(29) = c

as lone ranger was told by tonto

The sons of the squaw on the hippopotamus is equal to the sum of the sons on the other 2 hides

or the square of the hypotunus is equal to the sum of the squares of the other 2 sides

a^2= b^2 + C^2