A rectangular patio has a diagonal walkway. The length of one side of the patio is 9 meters long. The length of the other side of the patio is 12 meters long. How long is the walkway? Round your answer to the nearest tenth.

You will use the Pythagorean Theorem to find the length of the walkway.

A diagonal across creates 2 congruent triangles which are right triangles.

a^2 + b^2 = c^2

12^2 + 9^2 = c^2

144 + 81 = c^2

225 = c^2; find the square root of 225

c = 15 meters

The length of the walkway is 15 meters.