It is simply two 3:4:5 triangles. If you divide the square into two triangles and make similar triangles then you can compare. The diagonal is 20 which is 5 x "4". Multiply "4" to the 3 and 4 on the 3:4:5 triangle to get 12:16:20. Now you have the sides of one half of the square. That being 12 and 16. Add them up:
12
12
16
16
=56, which is approximate to 60....Answer Choice B.
4 Explanations