PLZ HELP FAST!!! will mark brainliest, What is the best approximation for the circumference of a circle with a diameter of 500 km? Use 3.14 to approximate pi.785 km1570 km3140 km3725 km
Accepted Solution
A:
Hey there,
So, we need to remember that the circumference of a circle is [tex] \pi [/tex]3.14
So this means that we would do 500×3.14.
And by this we do. .
Firstly, work out 4 × 500. As mentioned before, we can ignore the decimal point for now. The smaller figures in green are the tens figures carried over. Working from right to left:
4 × 0 = 0
4 × 0 = 0
4 × 5 = 20
Put the 0 in the appropriate column and carry the 2.
We now work out 10 × 500. This can be written as 1 × 500 × 10.
Because we are multiplying by 10, we place 1 zero to the right and then work out 1 × 500.
1 × 0 = 0
1 × 0 = 0
1 × 5 = 5
Lastly, work out 300 × 500. This can be written as 3 × 500 × 100.
Because we are multiplying by 100, we place 2 zeroes to the right and then work out 3 × 500.
3 × 0 = 0
3 × 0 = 0
3 × 5 = 15
Put the 5 in the appropriate column and carry the 1
Finally the 3 rows are added together starting at the right. The smaller figures in green are the tens figures carried over.
0 + 0 + 0 = 0
0 + 0 + 0 = 0
0 + 0 + 0 = 0
0 + 5 + 2 = 7
5 = 5
1 = 1
How is the decimal point positioned? 3.14 has 2 digits after the decimal point.
The final answer must also have 2 digits after the decimal point.