if big triangel=1 side, need 1 triangel tu kuver it
if base=2, need 4 triangels=1+3
if base=3, need 9...5+3+1
if base=4, need 7+5+3+1=16 triangels
if base=5, need 9+7+5+3+1=25 triangels
if base=6, need 11+9+7+5+3+1=36 tri
base=7, need 13+11+9+7+5+3+1=49
me assume yu kan keep goin til yu get tu 10