What is the area of the rectangle? (see attachment)

You need the Pythagorean theorem to solve for the side lengths.

Shorter side:
sqrt(6^2+1^2)=sqrt(37)
Longer side:
sqrt(12^2+2^2)=sqrt(148)

Now multiply the sides together to get:
sqrt(37*148)=sqrt(5476)=74

The length of what is left would be 1 1/2 feet long.

2.4+3.2t. you get the answer by adding the ones with variables and ones without