math grade 8
posted by mark .
Hi! I have to sketch 3D shape of the house using triangular prism, rectangular prisms, cube, and cylinder.I have to include measurement calculations with formulas. I already did it all, but someone told me that the SA (surface area) of my house calculated wrong. What I did is: SA = A1(which is rectangular prism- my door)+A2 (rectangular prism of my base house)+A3 (cube which is a window)+A4 (triangular prism- my roof)+A5 (cylinder is my chimney). I was told that I have to subtract the measurements of door, window and chimney. Please, help. Thank you in advance.