Question

The radius of a circle is 2.12metre .its area according to the rule of significant figure

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Answer 1

$Area = \pi r^{2}  \\         =3.14 * 2.12$$= \frac{314}{100} * \frac{212}{100}$$\frac{157}{25} * \frac{53}{50}$$\frac{157*53}{625} = \frac{8321}{625}$

hope it helps

Answer 2

Answer:

• The required area of the circle would be 4.4944π.
• If the value of pi(π) is taken as 3.14 the exact area of the circle would be 14.1 m².

Step-by-step explanation:

We have been given that radius of circle 2.12 m.

We have to find the area of circle according to the rule of significant figures.

• Radius of Circle = 2.12 m

The formula for area of a circle is given by = pi(π)*radius (r)²

In this given question,

The radius (r) is given as 2.12 m.

Therefore, the area of circle would can be calculated as follows: = π*r² units

• Area of Circle = πr² units
• Area of Circle = π(2.12)² m²A
• rea of Circle = 4.4944π m²

If the value of π is taken as 3.14 the exact area of the circle would be:

= 4.4944 * 3.14 m²

= 14.11 m²  

If we find the area of circle in the form of Significant figures, the exact area of the circle would be:

= 14.1 m²

Therefore, The required area of the circle is 14.1 m².