Question

Two solid cylinders with radii 5 cm and 10 cm and lengths 7 cm and 5 cm respectively a melted and recast into a cylindrical disc of thickness 3 cm. Calculate its radius.​

Answer 1

Answer:

14 cm

Step-by-step explanation:

V=$\pi$$r^{2}$L

$V_{3} = V_{1} +V_{2}$

$\pi r^{2} =\pi4^{2} 6 + \pi 5^{2} 4$

$R^{2} = 96+100\\R^{2} = 196\\R = 14 cm$

PLS MARK ME AS BRAINLIEST