chamber inner dia 0.45m height 1.5m and wall thickness is 0.23m how much bricks required

Question

chamber inner dia 0.45m height 1.5 m wall thickness is 0.23 m how much bricks required

Answer 1

?????????? how big be a brik ?????????

tu get volume av the cylinder with hole in it...leng* base area

base area=pi*(bigrad^2 - small rad^2)

small diam=0.45, so small rad=0.225 meter....square=0.0625

big diam=0.45+2* wall thik= 0.45+0.46=0.91

big rad=0.455 meter...square=0.207025

area=pi*(0.207025-0.0625)=3.14159*0.144525=0.454038677

volume=hite*area=1.5*0.454038677=0.681058016