Substitute: \( 2(4 \times 5 + 4 \times 6 + 5 \times 6) \).
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- Substitute: \( A = 3.14 \times 5^2 = 3.14 \times 25 = 78.5 \) square cm.
- A rectangular prism has dimensions 4 cm by 5 cm by 6 cm. What is its surface area?
- Surface area formula: \( 2(lw + lh + wh) \).
- Calculate: \( 2(20 + 24 + 30) = 2 \times 74 = 148 \) square cm.
- A sphere has a diameter of 10 cm. What is its surface area? Use \( \pi \approx 3.14 \).
- Radius \( r = \frac{10}{2} = 5 \) cm.
