Amazing numbers – 3

Amazing numbers – 3

squares

1 25 sq = 625

how we get 625 ??

6 = 2 * ( 2+1 ) = 6
5 sq = 25
hence 625

2 35 sq = 1225

3 * ( 3+1 ) = 12
then as usual 5 sq = 25
1225

4 45 sq = 2025

4 *5 = 20
5 sq = 25

then 2025

this route id followed till 95 sq

5 55 sq = 3025
5 * 6 = 30
5 sq = 25

6 65 sq = 4225

7 75 sq = 5625

8 85 sq = 7225
8*9 = 72
5 sq = 25

7225

9 95 sq = 9025
9*10 = 90
5 sq = 25

hence 9025

numbers are amazing na ??

BG Venkatesh