Question

what is the answer that I have post this picture all these questions plz quickly

Answer 1

1st question.
R=8cm.(8*2)
D=16cm.

R=10.5cm.(10. 5*2)
D=21cm.

R=21cm. (21*2)
D=42cm.

R=6.4cm(6.4*2)
D=12.8cm

2nd question.

D=8cm(8/2)
R=4cm.

D=10.6cm(10.6/2)
R= 5.3cm

D=18cm.(18 /2)
R=9cm




.
D=14.8cm(14.8/2)
R = 7.4cm

Hope that it will help you

Answer 2

1 question -
1). 12
2). 21
3. )42
4. )12.8
2 question-
1). 4
2)5.3
3)9
4)7.4