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(i) 1620 rectangles
(ii) 608 triangles
Edit for clarification: Rectangles are correct.
to account for the overlaps, we add as follows ...
case 5. triangles with base 8, height 4, base vertical, vertex above base, and 1 of the other 2 side is vertical
no of ways = 6 x 1 x 1 x 2 = 12
[case 5 accounts for overlap of cases 1 & 4]
case 6. triangles with base 4, height 8, base vertical, vertex above base, and 1 of the other 2 side is vertical
no of triangles = 2 x 5 x 1 x 2 = 20
[case 6 accounts for overlap of cases 2 & 3]
total ways = (54+100+90+60-12-20) x 2
= 544
thanks for highlighting the mistake ...