73) Find the surface area. Don't forget your
label.
8 cm
10 cm
18 cm
8 cm

512cm²

Step-by-step explanation:

1/2bh*2 = 1/2(4)(10)(2)=40

Each triangle is 40

18*8=144

Each rectangle is 144

144+144+144+40+40=512cm²

Step-by-step explanation:

x=15

y=12

divide 144 by 12 which equals 12 so 12 is y

divide 62 by 4 which equals 15.5 so round down to 15 then to double check times 15 times 4 then add two