At half depth, both height and radius of the water cone are half the cup’s dimensions. Since volume scales with the cube of dimensions, the water occupies (1/2)³ = 1/8 of the cup’s total volume.
Cbse Class 9 Maths Ganita Manjari Part 2 Solutions
Class 9 maths ganita manjari part 2 chapter 14 question answer
Let the conical cup have height H and radius R. When filled to half depth, water height is h = H/2. By similar triangles, the water surface radius is r = R/2. Water volume is Vwater = (1/3)π(R/2)²(H/2) = (1/8) × (1/3)πR²H = (1/8)Vcup. Hence, the water occupies 1/8 of the total volume of the cup.
For more NCERT Solutions of Class 9 Maths Ganita Manjari Part 2 Chapter 14 Math of Space: Surface Area and Volume Question Answer (2026-27)
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