Q1. Find the volume and surface area of the earth assuming itscircumference is 4

Question

Q1. Find the volume and surface area of the earth assuming itscircumference is 40000km. Q.2. The diameter of a scooter wheel is 44cm.How far will thescooter have travelled after 450 revolutions aof the wheel. Q.3. A goat is kept in a rectamgular field 14.5m by 22m. It istied to a pole at the centre of the field with a chain that is 2.5mlong. What is the surface of the field on which it will not be ableto graze? Q1. Find the volume and surface area of the earth assuming itscircumference is 40000km. Q.2. The diameter of a scooter wheel is 44cm.How far will thescooter have travelled after 450 revolutions aof the wheel. Q.3. A goat is kept in a rectamgular field 14.5m by 22m. It istied to a pole at the centre of the field with a chain that is 2.5mlong. What is the surface of the field on which it will not be ableto graze?

Explanation / Answer

1. The formula for the circumference of a circle is d=C sod=C/ (40000/)=12732.4 r=d/2=6366.2 a) 4r2=surface area=4(6366.2)2=5.093x108 km2 b)(4/3)r3=volume=(4/3)(6366.2)3=1.081x1012km3 2. The circumference of a circle is equal to d. (44cm)=138.23cm This number can then be multiplied by the number of revolutions tofind the total amount of ground that the wheel will cover. 138.23*450=62203.5 cm or 622.035 meters 3. Find the area of the circle the goat can graze in and subtractit from the total area of the rectangle. (14.5*22)-2.52=299.365 m2

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