Question

Hi all !! Please solve these maths questions step by step. Ch - Mensuration.
Please answer as soon as possible.....​

Answer 1

Answer:

3rd sum mein formula 1/2 X h Xb

Answer 2

Answer:

(1)

Diameter = 1.4m

Radius, r = 0.7m

Distance covered in 1 revolution, i.e. circumference = 2πr = 2 x 22/7 x 0.7 = 4.4m

Distance covered in 500 revolutions = 4.4x 60 = 264 m

1 km= 1000m

=0.264 km. ans

(2)

Given that side of the square is 22 cm

Perimeter of the square =4a

=4×22

=88 cm

As the same wire is used to form a circle then both will have same perimeter.

Perimeter of circle = Perimeter of square

⇒2πr=88

⇒2× 22/7r =88

⇒r=88/22*2/7

⇒r=14 cm

Hence radius of the circle is 14 cm.

then,

Area of the circle =πr2

22/7 ×14×14 =616 cm ans

(5)

Total length of the painting including the margin = 40 cm

Total width of the painting including the margin = 28 cm

Area of the painting including the margin = 40*28

Area of the painting including the margin = 1120 sq cm

Length of the painting without the margin = 40 - (2 + 2)

= 40 - 4

= 36 cm

Width of the painting without the margin = 28 - (2 + 2)

= 28 - 4

= 24 cm

Area of the painting without the margin = 36*24

Area of the painting without the margin = 864 sq cm

Area of the margin = Area of the painting including the margin - Area of the painting without the margin

⇒ 1120 - 864

= 256 sq cm

So, the total area of the margin is 256 sq cm