NCERT | Patterns | Intext | Pg.152 | Q1 — task. Maths CBSE Live product, Class 8 (2026-27).

Observe the pattern in the figure below.

The expression

k^{2} + 2 k

gives the number of circles at Step \(k\) of this pattern.

Use this formula to find the number of circles in Step \(13\).

Answer:

The number of circles in Step \(13\) is .

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3. NCERT | Patterns | Intext | Pg.152 | Q1