2 25x 20 = 500 square centimeters

10x 10x 3. 14x 2 = 628 cm2

500+628= 1 128cm2

1 2x2x 3. 14x 2+(2+2)x 3. 14x 4.5 = 8 1.64 dm2

2 6x6x 3. 14x 2+ 12x 3. 14x 16 = 828.96 cm2

10x 10x 3. 14x 2+20x 15x 3. 14 = 1570 cm2

3 8x 3. 14x 13+4x4x 3. 14 = 75.36

4 2 13.52-2x2x 3. 14x 2 = 188.4

188.4/(4x 3. 14)= 15cm

Still have to think more! ! !