I multiplied by the number of pyramids in each row by finding the area in square pyramids, then multiplying by 4 for each triangle. There are 15 rows in the first one.900+784+676+576+484+400+324+256+196+144+100+64+36+16+4=496015 14 13 12 11 10 9 8 7 6 5 4 3 2 1