Question

2. Without using a diagram, find
(i) 9th square number
•(ii) 7th triangular number
3. (i) Can a rectangular number be a square number?
(ii) Can a triangular number be a square number?​

Answer 1

Answer:

2

(i) 9th square number is 81

(ii) 7th triangular number is 7×4 = 28

3 (i) yes a rectangular number can be square number

(ii) In mathematics, a square triangular number (or triangular square number) is a number which is both a triangular number and a perfect square.