Question

13r A hollow garden roller 42 cm wide with a girth of
132 cm is made of cast iron 2 cm thick. Find the
volume of iron and the weight of roller, r1 cm of
Iron weighs 8.4 grams.
Hiat. 2 = 132. Find the external radius. Also, h - 42 cm.
42 cm
15.​

Answer 1

Step-by-step explanation:

girth means circumference

so circumference=440cm

2*pie*r=63

r=440*7/22*2=70cm

volume of cylinder=pie*(r^2)*h

here in this case ot will be=pie*((outer radius^2)-(inner radius^2))*h

inner radius=70-4=66cm

=> ((outer radius^2)-(inner radius^2))=70^2-66^2=544

pie*h*544=22*63*544/7=107712 cm^2 ans.

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