(1) There are two identical triangles in the graph, and the area of the triangle = base times height divided by 2; Then the area of a triangle is: 10 times 10 divided by 2 = 50; The area of two triangles is 100.

(2) Rectangular flower beds with a length of15m and a width of10m can be designed; It can also be designed as two circular flower beds with a radius of 5 meters; It can also be designed as an oval garden (a rectangle with a length of15m and a width of10m); It can also be made into two small rectangles. See figure