Question

If u have dare solve this one​

Answer 1

Mensuration:

Mensuration is the branch of mathematics which concerns itself with the measurement of Lengths, areas & volume of different geometrical shapes or figures.

Plane Figure: A figure which lies in a plane is called a plane figure.

For e.g:  a rectangle, square, a rhombus, a parallelogram, a trapezium.

Perimeter:

The perimeter of a closed plane figure is the total length of its boundary.

In case of a triangle or a polygon the perimeter is  the sum of the length of its sides.

Unit of perimeter is a centimetre  (cm), metre(m) kilometre(km) e.t.c

Area: The area of the plane figure is the measure of the surface enclose by its boundary.

The area of a triangle are a polygon is the measure of the surface enclosed by its sides.

A square centimetre (cm²) is generally taken at the standard unit of an area. We use square metre (m²) also for the units of area.

Circumference of a circle is the perimeter of a circle.

In a circle the radius is half of the diameter.

The approximate value of π( Pi) is= 22/7 

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Solution:

i)

Given:

Diameter = 2.8 cm

Radius= 2.8/2= 1.4 cm

Perimeter of the figure = Perimeter of Semicircular part + Diameter of the part

= πr + 2r

=(22/7) × (1.4)  + 2.8

= 22× .2 + 2.8 = 4.4+ 2.8

=7.2 cm

ii)

Given :

Diameter = 2.8 cm

Radius= 2.8/2= 1.4 cm

Perimeter of the figure = Perimeter of Semi-circular part + 2Length + Breadth

= πr +L+ 2B

= 22/7× 1.4  + 2.8+ 2× 1.5

= 22×.2 + 2.8+ 3
=4.4 + 2.8+ 3

=10.2 cm

iii)

Given :

Diameter = 2.8 cm

Radius= 2.8/2= 1.4 cm

Slant height= 2 cm

Perimeter of the shape = Perimeter of Semi-circular part + 2(slant height)

= πr + 2 (slant height)

= 22/7× 1.4  +2+2

=4.4 + 4

=8.4 cm

Hence, the food shape in (b) requires the ant to cover the more distance.

⟅H⟆⟅O⟆⟅P⟆⟅E⟆

 ⟅I⟆⟅T⟆

 ⟅H⟆⟅E⟆⟅L⟆⟅P⟆⟅S⟆

 ⟅Y⟆⟅O⟆⟅U⟆ 

Answer 2

8.4 is the correct answer for your question