tolong pakai caranya yaa....

3.= (s×s) + (s×s) + (1/2×a×t)
= (40×40)+(40×40)+(1/2×40×12)
= 1.600+1.600+240
= 3.440

4.(kurng yakn):-\

5. = (s×s) - (π×r×r)
= (21×21) - (3,14×10,5×10,5)
= 441 - 346,185
= 94.815