Solve this with the Pythagorean theorem, using only one of the right triangles to get half the length of AB:

a² + b² = c²
3² + b² = 4²
9 + b² = 16
b² = 7
b = square root of 7
Double the answer to get the total length of AB: 2 times square root 7.
(C)

Back to Red Answer Sheet

Back to Answer Sheet