Question

Which is the best estimate of the circumference of this circle?

Answer 1

Answer:

Circumference is 9 units.

Step-by-step explanation:

According to the formula of circumference

Circumference = $2\pi\times (radius of circle)$

Given, Radius i.e.   r = 1.5 units

  Circumference  = $2\times\frac{22}{7} \times 1.5$

                             = $\frac{660}{70}$

                             = 9.43 units

Therefore, the best estimate of the circumference of this circle is 9 units.

Answer 2

B  9 units

C = πd ( where d is the diameter )

here r = 1.5 ⇒ d = 2 × 1.5 = 3

as an estimate, approximate π to 3

C = 3 × 3 = 9 ← is the best estimate