Question

if the ratio of the height of two right circular cone is 2:3 and the ratio of length of their radii is 3:5 . then let us write by calculating the ratios of the volume of two cones​

Answer 1

Answer:

Let the height of two right circular cone be 2h and 3h and the length of the radii be 3r and 5r

volume = 1/3πr2h / 1/3πr2h

= 1/3×3r×3r×2h / 1/3×5r×5r×3h

= 3×2 / 5×5

= 6/25

= 6:25

hence, the ratio of the volume of the two cones is 6:25

Answer 2

Answer:

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volume of paint = 9.375 m2 = 93750 cm2

Dimension of brick = 22.5 cm×10 cm×7.5 cm

Total surface area of a brick = 2(lb + bh + lh) cm2 

= 2(22.5×10 + 10×7.5 + 22.5×7.5) cm2

= 2(225 + 75 + 168.75) cm2

= 2×468.75 cm2 = 937.5 cm2

Number of bricks can be painted = 93750/937.5 = 100