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To calculate the surface area of a cuboid, we use the formula:

\[
\text{Surface Area} = 2(\text{length} \times \text{width} + \text{length} \times \text{height} + \text{width} \times \text{height})
\]

Here, the length \( l = 20 \, \text{cm} \), the width \( w = 11 \, \text{cm} \), and the height \( h = 13 \, \text{cm} \).

Substitute the values into the formula:

\[
\text{Surface Area} = 2(20 \times 11 + 20 \times 13 + 11 \times 13)
\]
\[
= 2(220 + 260 + 143)
\]
\[
= 2(623)
\]
\[
= 1246 \, \text{cm}^2
\]

Thus, the surface area of the cuboid is **1246 cm²**.

Would you like a further breakdown or have any questions?

Here are 5 related questions to deepen understanding:
1. How would the surface area change if the height were doubled?
2. What is the volume of the cuboid?
3. Can you find the length of the diagonal of the cuboid?
4. How would the surface area formula change for a cube?
5. How can you apply this formula to real-world objects?

**Tip:** For cuboids, always check the units of each dimension before calculating surface area or volume.

A cuboid has a length of 20 cm, a width of 11 cm, and a height of 13 cm. What is the surface area of the cuboid? Give your answer in cm².

Learn how to calculate the surface area of a cuboid with dimensions 20 cm by 11 cm by 13 cm. This step-by-step guide covers key geometric concepts and the formula for surface area. Suitable for students in Grades 5-7.

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