Answer:
1st question
63.63
2nd question
28.3
3rd question
25.1
4th question
70.4
5th question
1404.93
Explanation:
1.
area= π×r^2
3.142×4.5squared
radius is 4.5
4.5 squared is 20.25
20.25×3.142 is 63.6255
2.d.p is 63.63
2.
circumference is pi times diameter
3.142×9 is 28.278
1.d.p is 28.3
3.
4×2=8 (diameter)
circumference is pi times diameter
3.142×8=25.136
1.d.p=25.1
4.
11.2×2=22.4(diameter)
circumference is pi times diameter
3.142×22.4=70.3808
1.d.p=70.4
5.
area is pi times radius squared
radius=11.2
11.2 squared is 125.44
3.142×125.44=1404.928
2.d.p=1404.93
hope this helps!