Find the approximate circumference(m) if the diameter is 3 m

Step-by-step explanation:

Given :-

To find :-

Solution :-

To Find the approximate circumference when the diameter is given,Use this formula :-

Note: d means diameter.

[Another Note: π is multiplied with diameter(d)]

We know that the value of π is,

So, put the value of π [3.14] and diameter [3m] :-

As we need to find the circumference in "m", keep 3.14 × 3 in brackets and keep "m"outside the Brackets.

Simplify the RHS.

Multiply 3.14 and 3:-

We are done!

Hence, the circumference of the circle is 9.42 m.

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Answer with explanation:

We have to make the following conversions:

a)

90 kilometers to meters.

We know that 1 kilometer=1000 meters.

Hence,

90 kilometers=90000 meters.

b)

250 centimeters to hectometers.

We know that:

1 centimeter=0.0001 hectometers.

Hence, 250 centimeter=0.0250 hectometer.

c)

3500 millimeters to decameters.

1 millimeter=0.01 decimeter.

and 1 decimeter=0.01 decameter.

Hence,

3500 millimeter=0.35 decameter.

d)

10 dekameters to decimeters.

We know that:

1 decameter=100 decimeters.

Hence,

10 decameter=1000 decimeter.