Her average speed was 12 miles per hour. Total distance over total time.
The geometric mean of two numbers is the square root of their product.
sqrt{4 • 12}
sqrt{48}
sqrt{16} •sqrt{3}
4•sqrt{3}.
The geometric mean of 4 and 12 is
4•sqrt{3}.
I think 6x3=18
So, the answer is 18
A: rhombus and squares have four equal sides.