Question: Consider ◯ C below.
243°
5 m
What is the area of the shaded region? You may round to two decimal places.
1. **State the problem:** We need to find the area of a sector of a circle with radius $5$ meters and central angle $243^\circ$.
2. **Formula for the area of a sector:** The area $A$ of a sector with radius $r$ and central angle $\theta$ (in degrees) is given by:
$$A = \frac{\theta}{360} \times \pi r^2$$
3. **Substitute the given values:**
$$A = \frac{243}{360} \times \pi \times 5^2$$
4. **Calculate the radius squared:**
$$5^2 = 25$$
So,
$$A = \frac{243}{360} \times \pi \times 25$$
5. **Simplify the fraction:**
$$\frac{243}{360} = \frac{\cancel{243}}{\cancel{360}}$$
Since $243$ and $360$ share a common factor of $9$:
$$\frac{243 \div 9}{360 \div 9} = \frac{27}{40}$$
So,
$$A = \frac{27}{40} \times \pi \times 25$$
6. **Multiply the constants:**
$$\frac{27}{40} \times 25 = \frac{27 \times 25}{40} = \frac{675}{40}$$
Simplify by dividing numerator and denominator by 5:
$$\frac{\cancel{675} \div 5}{\cancel{40} \div 5} = \frac{135}{8}$$
So,
$$A = \frac{135}{8} \pi$$
7. **Calculate the numerical value:**
$$A \approx \frac{135}{8} \times 3.1416 = 16.875 \times 3.1416 \approx 52.96$$
8. **Final answer:**
The area of the shaded sector is approximately $52.96$ square meters.