Question

A rectangular piece of paper 15 cm by 7 cm is folded along the dotted lines to form the figure shown​

Answer 1

Length = 11 cm

Breadth = 4 cm.

When the rectangle is converted into a cylindrical shape

Since the rectangle is rolled along it's width to make cylinder.

Height of cylinder = Width of rectangle = 4 cm

Let the radius of the cylinder be r

∴ Perimeter of the cylinder = length of the rectangle.

So by the formula of circumference circle

2πr=11

⇒2×

7

22

×r=11

⇒

7

44

×r=11

⇒r=11×

44

7

=

4

7

Volume of cylinder = πr

2

h

=

7

22

×

4

7

×

4

7

×4

=

2

77

=38.5cm

3

solution

Answer 2

Answer:

Step-by-step explanation:

Area of square =7*7=49

Area of 2nd square =7*7=49

By folding half the square area =24.5

Middle rectangle area =7*1=7

Total area of the figure formed =24.5+24.5+7=56sqcm