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Grade: 7

                        

One side of an equilateral triangle is 24 cm. The mid points of its sides are joined to form another triangle whose mid points in turn are joined to form still another triangle. The process continues indefinitely. Find the sum of the perimeters of all the triangles.

6 years ago

Answers : (5)

bharat bajaj
IIT Delhi
askIITians Faculty
122 Points
							The side of triangle 1 : 24 cm
The side of triangle formed by joining midpoints : 12 cm
and so onn..
Sum of perimeter - 3(24) + 3(24)/2 + 3(24)/4 + 3(24)/8 .....
= 3(24) [ 1 + 1/2 + 1/4 + 1/8....]
= 3(24)[1/1/2]
=3(2)(24) = 144 cm
Thanks
Bharat Bajaj
IIT Delhi
askiitians faculty
6 years ago
Apptica Corporations
37 Points
							The larger triangle will have the perimeter 72 cm. After joining the mid points of the triangle a small triangle also called pedal triangle is formed whose sides are 12 cm and perimeter 36 cm.

This process continues to infinite so we have---->
Perimeter= 72+36+18+9+............ which forms an infinite Geometric progression with common ratio 1/2.

Sum= First Term/(1- common ratio) = 72/(1-0.5) = 144cm
						
6 years ago
chandramouli
23 Points
							144
						
6 years ago
chandramouli
23 Points
							the first triangle we form length of the side become half &it continues so long as we calculate 
          24(3)+12(3)+6(3)+3(3)+3/2(3)+3/4(3)+..........=144
						
6 years ago
Sher Mohammad
IIT Delhi
askIITians Faculty
174 Points
							72+72/2+72/4......
72(1/1-1/2)=144
6 years ago
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