A diagram of a coin is shown. What is the approximate circumference of the coin? Use 3.14 as an estimate for Pi.
A-21 mm
B-3mm
C-66mm
D-84mm

C. 66 mm (using 3.14, it would be 65.94 mm)

Step-by-step explanation:

From what I know, the radius of this coin is 10.5 mm.

The formula for the circumference of a circle is 2πr or πd.

In this case we're using 3.14 for π.

(2 * 10.5) * 3.14

21 * 3.14

21 * 3.14 is the same as 62.8 + 3.14

62.8 + 3.14

65.94 mm

This is close to 66 mm, which was C, so that is the answer.

your answer would be b

step-by-step explanation:

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b