Practicing Success
What is the area of a sector of a circle of radius 7 cm and central angle 180°? |
78 cm2 77 cm2 154 cm2 38.5 cm2 |
77 cm2 |
Area of sector = \(\frac{θ°}{360°}\) \(\pi \) r2 = \(\frac{180°}{360°}\) × \(\frac{22}{7}\) × 7 × 7 = \(\frac{1}{2}\) × \(\frac{22}{7}\) × 7 × 7 = 77 cm2 |