This is an equilateral triangle of height a√3/2 where a is the side length. So the area is ½a.a√3/2=a²√3/4.
So a²=25 and a=5cm. Therefore the perimeter is 3a=15cm.
8th term = 256/729
Step-by-step explanation:
Ratio = a2/a1
2/3 = a2/6 a 2=2/3*6 =12/3 =4 a2=4
1) 6* 2/3=4
2) 4*2/3=8/3
3) 8/3*2/3 = 16/9.......
