Answer:
1) 12, 24, 75.36, 452. 16
2) 9, 18, 56.52, 254.34
3) 7.5, 15, 47.1, 176.63
4) 18.5, 37, 116.18, 1074.67
5) 10.5, 21, 65.94, 346.19
Explanation:
Diameter is twice the radius
The circumference follows the formula: 2πr or πd
The area follows the formula: πr²