Question

How many coins of diameter 1.5cm and height 0.2 cm are to be melted to form a right circular cylinder of 4.5cm diameter and height 8cm?

Answer 1

ANSWER -

FIRSTLY,

VOLUME OF RIGHT CIRCULAR CYLINDER
= pie×radius×height = 22/7× 4.5/2×4.5/2×8= 508.93801

VOLUME OF ONE COIN = pie×radius× height
= 22/7×1.5/2×1.5/2×0.2= 1.413716

COINS MELTED TO FORM CYLINDER = 508.93801÷1.413716 = 360 approximately