Question

Find the perimeter of semi circle whose diameter is 2.8m?

please answer my question

l will mark u as branlist and thanks your answer

NO SPAM OR REPORTED​

Answer 1

Answer:

Diameter of circle = 2.8

Radius = 2.8/2 = 1.4m

Perimeter of semi circle = πr = 22/7 * 1.4 = 4.4 m

Hope it will help u...

Answer 2

Given,

Diameter of the semicircle – 2.8 m

To find,

The perimeter of the circle

Solution,

Diameter of the semicircle = 2.8 m

Radius = 2.8/2 = 1.4 m

Formula to find perimeter of a semicircle = πr

= $\sf{\dfrac{22}{7}\times1.4}$

= 4.4 m

Therefore, the perimeter of the semicircle is 4.4 m.

Knowledge Bytes:

→ Semicircle –  

Half of a circle is known as semicircle.

$\setlength{\unitlength}{1mm}\begin{picture}(50,55)\linethickness{0.4mm}\qbezier(45,30)(45,30)(5,30)\qbezier(25.000,10.000)(33.284,10.000)(39.142,15.858)\qbezier(39.142,15.858)(45.000,21.716)(45.000,30.000)\qbezier(45.000,30.000)(45.000,38.284)(39.142,44.142)\qbezier(39.142,44.142)(33.284,50.000)(25.000,50.000)\qbezier(25.000,50.000)(16.716,50.000)(10.858,44.142)\qbezier(10.858,44.142)( 5.000,38.284)( 5.000,30.000)\qbezier( 5.000,30.000)( 5.000,21.716)(10.858,15.858)\qbezier(10.858,15.858)(16.716,10.000)(25.000,10.000)\multiput(5,30)(20,0){3}{\circle*{1}}\end{picture}$

In this figure, the diameter divides the circle into two equal semi-circles.

→ Derivation of perimeter formula [semi-circle]

Perimeter of a circle = 2πr

As a semicircle is half of a circle, we can write down as

$\sf{\dfrac{1}{2}\times2\times\pi\timesr}$

= πr