Answer:
4.1 m
Explanation:
The distance between Chad and his Sister is one leg of a right triangle. The other leg is 8 m, and the hypotenuse is 9 m. The Pythagorean theorem is used to find the distance of interest (x).
x^2 +8^2 = 9^2
x^2 = 81 -64 = 17
x = √17 ≈ 4.1 . . . . meters
Chad and his younger sister are about 4.1 meters apart.