Question

The sum of the circumference and the diameter of a circle is 145 cm. what is the length of its circumference?​

Answer 1

Answer:

Step-by-step explanation:

145=2xPixr+ 2r

145=2r(pi+1)

145/(pi+1)=2r

U will get radius from here

Now find perimeter of circle

By pyscopath

Answer 2

The length of its circumference is 110 m .

Step-by-step explanation:

Let the radius of circle be r

Circumference of circle= $2 \pi r$

Diameter of circle =$2 \times Radius = 2r$

The sum of the circumference and the diameter of a circle is 145 cm

So, $2\pi r+2r=145\\2 \times \frac{22}{7} \times r+2r=145\\2r(\frac{22}{7}+1)=145\\2r=\frac{145}{\frac{22}{7}+1}\\r=\frac{145}{2(\frac{22}{7}+1)}\\r=17.5$

Circumference of circle =$2 \times \frac{22}{7} \times 17.5=110 cm$

Hence the length of its circumference is 110 m .

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If the radius of the earth4900km what is the length of its circumference​

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