Answer:

1.) D=18dm

C=48cm²

2.) r=6.5cm

c=21cm²

3.) D=20.8cm

C=40.4cm²

4.) C= (4cm+4cm)=8cm²(4 divide by 2)=2cm²

2cm times 4=8cm² times 2=16cm²

5.)C= (6cm+6cm)=12cm² (6 divide by 2)=3cm²

3cm² times 6= 18cm² times 2= 36cm²

BRAINLIEST PLEASE, THANK YOU!

Answer:

1) 56.52

A = πr²

π cm = 56.52 cm

2) 20.42

c = 2πr

π cm² = 33.183 cm²

3) 65.3

c = 2πr

π cm = 65.345 cm

4) 12.5

c = 2πr

π cm = 12.5664 cm

5) 37.6

c = 2πr

π cm = 37.699 cm