Timothy has a fenced-in garden in the shape of a rhombus. The length of the longer diagonal is 24 feet, and the length of the shorter diagonal is 18 feet. What is the length of one side of the fenced-in garden?

a) 12 ft

b) 15 ft

C) 21 ft

d) 108 ft

One property of the diagonals of a rhombus is that they are perpendicular bisectors of each other. So 4 congruent right triangles will be formed when you draw the two diagonals. Considering one right triangle, we can solve for the two sides by dividing them by 2.

24 ft / 2 = 12 ft

18 ft / 2 = 9 ft

Using the Pythagorean Theorem, we can now solve for the hypotenuse which is the side of the rhombus.

side = √ (12²+9²) = 15 ft

The answer is B.