Please help me, I do not understand what I am getting wrong. I did this and got 205 for lateral area, but it says I am wrong? What am i doing wrong??

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1 Answer
P dilip_k
Apr 22, 2018

Height of each of 4 triangles at the the top is #sqrt(3^2+2.5^2)#inch
Base of each of these 4 triangle is #5#inch
So area of each of these triangles
#A_1=1/2xx5xxsqrt(3^2+2.5^2)~~9.76# #"inch"^2#

Area of each of 4 squares at the middle

#A_2=5^2=25# #"inch"^2#

Area of each 4 triangles at the lower part

#A_3=1/2xx5xx7.5=18.75# #"inch"^2#

So total surface area

#A_T=4(A_1+A_2+A_3)#

#=>A_T=4(9.76+25+18.75)~~214.04# #"inch"^2#

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