1 15 x 3 15 July 8, 2019 16 32 64 128 15 x 15 x 3 1 4 15 x 3 x 1 5 x 1 15 3 x 1 2 15 15x 3 * 25 1 3 x 152 * 15 X 15 1 3 x 15 )= 32 4 15 x 1 3 x 15 20 1 3 x 3.14 x 15 x 15