Question

please answer at least one

but if answered all that would we be immensely appreciated
thank you
will surely mark as the brainliest then

Answer 1

9. D=28 cm

therefore, r=d/2=14 cm

Now,volume of sphere=4/3pie r^3

= 4/3×22/7×14×14

=11498.66 cm^3

10. Original radius=r Reduced radius=r/2 Volume of reduced cylinder/volume of cylinder cylinder

that gives us the ratio 1/4

11. l = 7m, n = 6.5m and h = 4m

∴ Area of the room = 2( l + b)h = 2(7 + 6.5) 4 = 108m2

Area of door = 3 × 1.4 = 4.2m2

Area of one window = 3 × 2 = 6m2

∴ Area of 3 windows = 3 × 2 = 6m2

∴ Area of the walls of the room to be colour washed = 108 - (4.2 + 6) = 108 - 10.2 = 97.8m2

∴ Cost of colour washing @ Rs. 15 per square metre = Rs. 97.8 × 15 = Rs. 1467.