Calculate: \( 4 \times 3.14 \times 25 = 314 \) square cm.
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- Radius \( r = \frac{10}{2} = 5 \) cm.
- Surface area formula: \( 4\pi r^2 \).
- Substitute: \( 4 \times 3.14 \times 5^2 \).
- A triangle has sides of 7 cm, 24 cm, and 25 cm. Is it a right triangle? If so, what is its area?
- Here, \( 7^2 + 24^2 = 49 + 576 = 625 \) and \( 25^2 = 625 \).
- Since they are equal, it is a right triangle.
