Calculate the total surface area of potato chip B using the formula, Total surface area = 2XY + 2XZ + 2YZ - Edexcel - GCSE Biology - Question 9 - 2018 - Paper 1

To calculate the total surface area of potato chip B, we first substitute the values into the formula:

• Length of X (5.0 cm)
• Length of Y (2.0 cm)
• Length of Z (2.0 cm)

Using the formula:

$$ext{Total surface area} = 2XY + 2XZ + 2YZ$$

Substituting the values:

$$ext{Total surface area} = 2(5.0)(2.0) + 2(5.0)(2.0) + 2(2.0)(2.0)$$

Calculating each term yields:

• First term: $2(5.0)(2.0) = 20$ cm²
• Second term: $2(5.0)(2.0) = 20$ cm²
• Third term: $2(2.0)(2.0) = 8$ cm²

Now, summing all the terms:

$$ext{Total surface area} = 20 + 20 + 8 = 48 ext{ cm}^2$$

Thus, the total surface area of potato chip B is 48 cm².