Doubt by Saksham
Solution :
When the Right Triangle is rotated with about 4 cm side then the resulting figure will be a solid cone of radius 3 cm, height 4 cm and slant height 5 cm.
r = 3 cm
h = 4 cm
l = 5 cm
Volume of the solid
= Volume of the cone
= (1/3)πr²h
= Volume of the cone
= (1/3)πr²h
= (1/3)π(3)²(4)
= 12π cm³
= 12π cm³
Total Surface area of the solid
= Total surface area of the cone
= πr(l+r)
= π(3)(5+3)
= π(3)(8)
= 24π cm²
= 24π cm²