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Height of the cone = 8.25 - 5.5= 2.75 m
Slant height of the cone (l)= Under root h2 + r2 = 15.25
surface area of cone= πrl = 3.14 × 15 × 15.25= 718.3
surface area of cylinder = 2πrl = 2 × 3.14 × 15 × 5.5= 518.1
area of canvas used = 718.3 + 518.1 =1236.4
length of canvas = 1236.41.5=824.26 m
Means 825
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