The length of ef in the right triangle

In order to find the sides of a right triangle, you can use the pythagorean theorem. (a^2 + b^2 = c^2)

The pythagorean theorem basically means that the square of two sides is equal to the square of the hypotenuse (the longest side of a triangle)

In this case, we already have 'a' and 'c', but not 'b'.

12^2 + b^2 = 19^2

Mutliply everything:

144 + b^2 = 361

Isolate b into one side by subtracting both sides by 144:

b^2 = 217

Square root both sides in order to completely isolate b:

b =

The answer is Option F

Good luck!

it would open into a square depending on the type of envelope i’m not sure about the second part

inch

step-by-step explanation:

yard and mile are too big.