Question

The diameter of the innermost concentric circle is 5 cm. If each outer circleis bigger than the other in diameter by 2 cm, what is the radius of the fourth circle from the centre?​

Answer 1

Answer:

Concentric circle means having same centre.

Radius of fourth circle = 5.5 cm

Step-by-step explanation:

The diameter of first circle ( a ) = 5 cm

The diameter of fourth circle ( t4 ) = ?

Common Difference ( d ) = 2 cm

We know that ,

tn = a + ( n - 1 ) d

t4 = 5 + ( 4 - 1 ) × 2

t4 = 5 + 6

t4 = 11 cm

Thus, the diameter of fourth circle is 11 cm.

Radius = d/2

11/2

5.5 cm

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