Since weight is proportional to volume, the volume ratio is 5920 / 740 = 8. Thus, the radius ratio is the cube root of 8, which is 2. The larger sphere’s radius is 2 × 2.5 = 5 cm. Ganita Manjari ...
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For a spherical ball bearing with radius 0.7 cm, the surface area formula 4πr² gives 4 × (22/7) × 0.7 × 0.7 = 6.16 cm². Class 9 Ganita Manjari Part 2 book Chapter 14 Question Answer Chapter 14 Math of Space ...
For (i) intersecting: 3x + 2y – 9 = 0 (since 2/3 ≠ 3/2). For (ii) parallel: 2x + 3y – 12 = 0 (equal coefficients, different constant). For (iii) coincident: 4x + 6y – 16 = 0 (doubling every ...
Let length be x and width y. Half perimeter is x + y = 36 and x – y = 4. Adding them gives 2x = 40, so x = 20 m and y = 16 m. Dimensions are 20 ...
This pair has no solution. Here a₁/a₂ = 2/4 = 1/2, b₁/b₂ = -2/(-4) = 1/2, but c₁/c₂ = -2/(-5) = 2/5. Since the slopes match with differing constants, the plotted lines are parallel. Ganita Manjari Class 9 Maths part 2 ...