How would weather reporter read 0.103 meter?

I'm guessing that you are asking how you read that decimal verbally or in word form.  Here is a trick that I have taught my students to remember how to read the multitude of decimal places that cause them stress.

Starting at the decimal draw a line under the digits to the last number.  Under the decimal write a 1.  For each other digit that remains, place a zero underneath.  You have created a fraction.  Now simply read the number as if it were a fraction.  This would be zero and one hundred three thousandths.

0.103
 1000

A= r2 × 3.14 11×11 ↓ ↓ 121 × 3.14 = 379.94 → 379.9