3.15 Round the following measurement to three significant figures: 0.90985 cm2
. [1]
A. 0.91 cm2
B. 0.9099 cm2
C. 0.910 cm2
D. 0.909 cm2

To round the measurement \(0.90985 \, \text{cm}^2\) to three significant figures, follow these steps:

1. Identify the first three significant digits: \(0.909\).
2. Look at the fourth digit (8 in this case) to determine whether to round up or keep the third digit the same.
3. Since the fourth digit is 8 (which is greater than 5), round up the third significant digit (9) by 1.

So, \(0.90985 \, \text{cm}^2\) rounded to three significant figures becomes \(0.910 \, \text{cm}^2\).

Thus, the correct answer is:

**C. \(0.910 \, \text{cm}^2\)**

Would you like any further details or have any questions?

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**Related Questions:**

1. How do you round a number to two significant figures?
2. What is the significance of significant figures in scientific measurements?
3. Can you explain the difference between significant figures and decimal places?
4. How do you determine the number of significant figures in a given number?
5. Why is rounding important in measurements and calculations?

**Tip:** Always consider the digits after the last significant figure when rounding to ensure accuracy.

Learn how to round 0.90985 cm² to three significant figures with a detailed step-by-step solution. Understand the importance of significant figures in scientific measurements. Suitable for high school students studying scientific notation and precision in measurements.

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