①、②、③画图如下:④C点可用数对是(12,5);⑤图①的实际周长:1×2×2+1×4=4+4=8(厘米)=0.08(米);图②的实际面积: 1 2 ×1×3=1.5(平方厘米)=0.00015(平方米)故答案为:(12,5),0.08,0.00015.