Answer:
6. surface area= 2πrh
where r=radius of the base
h=height of the cylinder
π=pie
π=22/7, r=3.6, h=8.5
2×22/7×3.6×8.5= 192.3cm²
square root of 192.3 is 13.9, the one whose square root is closest to that of 192.3 in the options is 178 whose square root is 13.3. A
7. volume=product of the height and its base area
volume=πr²h
22/7×3.6²×8.5 = 346.2. D
6) B
7) D
Explanation:
6)
The surface area of a cylinder is 2 * pi * r * (r + h)
SA = 2 * 3.14 * 3.6 * (3.6 + 8.5) = 2 * 3.14 * 3.6 * 12.1 = 273.6 cm^2
7)
The volume of a cylinder is pi * r^2 * h
V = 3.14 * (3.6)^2 * 8.5 = 345.9 cm^3
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