Star617 發問於 科學及數學數學 · 3 年前

# F3 Maths Area and Volume?

A toy bullet consists of a cylinder and a right cone. If the volume of the cylinder is 6 times of that cone, find

(a) the height and slant height of the cone

(b) the total surface area of the bullet

### 1 個解答

• 3 年前
最愛解答

(1/3)(pi)(1.2^2)(high of cone)/(pi)(1.2^2)(4.8-high of cone)=1/6

(1/3)(high of cone)=(1/6)(4.8-high of cone)

2h=4.8-h

h=1.6

l^2=h^2+r^2

l=2

b)surface area of cylinder=(2)(pi)(1.2)(4.8-1.6)=24.13

surface area of cone=(pi)(1.2)(2)=7.54

area of base=(pi)(1.2^2)=4.52

total surface area=36.19

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