Question

A block of stone measures 15 cm X 15 cm X 20 cm. What is the total surface area of the stone?(Hint: A block has six sides.)

Answer 1

`Look\ at\ the\ picture.\\\\2\ sides:\ 15cm*15cm\\\\Area:A_1=2*(15cm*15cm)=2*225cm^2=450cm^2\\\\4\ sides:15cm*20cm\\\\Area:A_2=4*(15cm*20cm)=4*300cm^2=1200cm^2\\\\Area\ of\ the\ block:\\\\A=A_1+A_2\\\\\boxed{A=450cm^2+1200cm^2=1650cm^2}`