Answer:
9. b) 31.4cm
10. Medium pizza
Step-by-step explanation:
9. Circumference of a circle: 2πr
10cm ÷ 2 = 5 cm (radius)
= 2×π×5
= 31.4159265359
≈ 31.4 cm (B)
10. Area of a circle: πr²
Area of small pizza= π×9²
= 254.469004941
≈254 in²
Area of medium pizza= π×12²
= 452.389342117
≈ 452 in² (closest to 400 in²)
Area of large pizza= π×15²
= 706.858347058
≈ 707 in²
