Since the end of the slide is 1 foot above the ground, the vertical rise of the
slide is 8 - 1 = 7 feet, and since the slide rises at a 45 degree angle it will
have a horizontal run of 7 feet as well. Thus by Pythagoras the length of the
slide is sqrt(7^2 + 7^2) = sqrt(98) = 9.90 feet, which is about 10 feet.
