14) A chimney has the dimensions shown. What is the outside surface area of the chimney? Give your answer to the nearest hundredth of a square metre.
Lables:
r1 & h1= big cylinder
r2 & h2= small cylinder
SA= 2π(r1xh1) + 2π(r2xh2) + [πr2^2 - πr1^2]
SA= 2π(25)(90) + 2π (15)(40) + [π(25)^2 - π(15)^2]
SA= 14137.17cm^2 + 3769.91cm^2 + [1963.50 - 706.86]
SA= 14137.17cm^2 + 3769.91cm^2 + 1256.64cm^2
SA= 19163.71cm^2
Conversion:
1963.71cm^2 x 1m^2/10000cm^2=1.92m^2
Answer: 1.92m^2
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