Hitung lah luas dari lingkaran berikut! ​

Jawab:

a. r = 21

= phi x r xr

l=22/7 x 21 x 21

=22x 3 x 21

=66x 21

=1,386

c=r= 36

l= 3.14 x 36 x 36

= 4,069.44

e. d = 84

r = 84 : 2 =42

l=22/7 x 42 x 42

=22 x 6 x 42

=5,544

b.r 20

l=3,14 x 20 x 20

= 31,4 x 2 x 20

=1,256

d = 56

r = 56 : 2 =28

l  = 22/7 x 28 x 28

= 22 x 4 x 28

=3,136

f : d = 60

r = 60: 2 = 30

l= 3.14 x 30 x 30

= 31,4 x 3 x 30

=94.2 x 30

=2,826

Penjelasan dengan langkah-langkah: