Final answer:
To calculate the length b, choose the option from the given choices and round it to two decimal places. Option b. 21.64 is already rounded to two decimal places.
Step-by-step explanation:
Calculation of Length b
To calculate the length b, we need to choose the correct option from the given choices and round it to two decimal places.
Given options:
1. 27
2. 21.64
3. 468.23
4. 20.46
To round a decimal number to two decimal places, you need to look at the third decimal place:
• If the third decimal place is less than 5, round down.
• If the third decimal place is 5 or greater, round up.
From the given options, option b. 21.64 has two decimal places, so it is already rounded to two decimal places. Therefore, the length b is 21.64.