011-40705070  or
Select Board & Class
• Select Board
• Select Class

The area of an equilateral triangle ABC is 17320.5 cm2. With each vertex of the triangle as centre, a circle is drawn with radius equal to half the length of the side of the triangle (See the given figure). Find the area of shaded region. [Use π = 3.14 and]plz answer this question....and plz tell me step by step......can anyone...help me..

Asked by Rahila(The Central School) , on 17/10/14

Let the side of the equilateral triangle be a.

Area of equilateral triangle = 17320.5 cm2

Each sector is of measure 60°.

Area of shaded region = Area of equilateral triangle − 3 × Area of each sector

Posted by Mohilon 1/2/12

area of ABC = 1.743205/4 a2

17320.5 = 1.73205/4 a2

a2 = 17320.5 * 4 / 1.73205

a2 = 10000 * 4

a2 = 40000

a = 200cm

area of three sectors = 3( theta/360 pie r2)

= 3(6 0/360 * 3.14 * 100  *100)

= 3(1/6 * 314 * 100)

=134*50

= 15700cm2

area of shaded region = aria of ABC - areaof three sectors

area of shaded region = 17320.5 - 15700

area of shaded region = 1620.5 cm2

Posted by Thunder Storm(Maharishi Vidya Mandir Chhatarpur) on 1/2/12

guys thankyou.....

Posted by Anushka Das(KENDRIYA VIDYALAYA) on 2/2/12

what matttttttt  said is correct.

Posted by Sathish Kumar(WFA) on 2/2/13

1620.5 cm2is the area of the shaded region! :D

Posted by Namrata Bhirudon 17/10/14