# What is the approximate uncertainty in the area of a circle

1. Sep 6, 2013

### eddiedowen

1. The problem statement, all variables and given/known data
Approximate uncertainty in the area of a circle of radius 5.5×10^4 cm?

2. Relevant equations
πr^2

3. The attempt at a solution

2. Sep 6, 2013

### MrAnchovy

What are the smallest and largest possible values for the radius? What are the smallest and largest possible values for the area?

3. Sep 6, 2013

### eddiedowen

It doesn't say. That's all the information it gives. That's why I was confused.

4. Sep 6, 2013

### MrAnchovy

Well if the radius is stated to two significant figure as 5.5×10^4cm then the uncertainty is ±0.05x104cm (or ±500cm) and the possible range is 5.45x104cm to 5.55x104cm.

5. Sep 17, 2013

### Staff: Mentor

People, please report members that do not fill out the template, it is against our rules for members to request help without completing the entire template, especially the part explaining what they've already done to soleve the problems themselves.