hlo✌️
plzz Solve question 7,8,9 ✌️
Answers
Answer:
7) Radius of cylinder=3.5cm
height of cylinder=10.5 cm
Total surface area of cylinder=2πr(r+h)
2x22/7x3.5(3.5+10.5)⇒22x14=308cm²
for 1 cylinderstand cardbord sheet require=308cm²
for 25.....................................................=308x25=7700cm²
volume of cylinder=πr²h=22/7x3.5x3.5x10.5=404.25cm³
8)Given : Length of the cuboid = 30 cm
And having cross sections like squares of side 14 cm
So, height and breadth of cuboid is 14 cm.
For maximum possible volume of cylinder,
Radius of cylinder = 7 cm
Length of the cuboid = height of the cylinder = 30 cm
So,
Volume of cylinder = πr²h
= 22/7*7*7*30
Volume of the cylinder = 4620 cm³
Now,
Volume of the cuboid = L*B*H
30*14*14
Volume of the cuboid = 5880 cm³
Volume of the wood left as wasted = Volume of the cuboid - Volume of the cylinder
= 5880 - 4620
Volume of the wood wasted = 1260 cm³
9)Given radius = 3.5cm
height = 7.5cm
Curved Surface Area of cylinder = 2πrh
= 2*22/7 *3.5 *7.5
= 165 cm2
Total Surface Area of cylinder = 2πr(h+r)
= 2 *22/7 * 3.5(3.5+7.5)
= 242cm2
Ratio of Total Surface Area of cylinder : Ratio of Curved Surface Area of cylinder
= 242 : 165
22:15
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
yuvii I think it's help you ❤️❤️❤️❤️❤️
