pakai caranya luas dan keliling no a sampai f. tolong ya bantu pls

a) r = 21 cm
L = π × r²
= 22/7 × 21 × 21
= 1.386 cm²
K = 2 × π × r
= 2 × 22/7 × 21
= 132 cm

b) r = 30 cm
L = π × r²
= 3,14 × 30 × 30
= 2.826 cm²
K = 2 × π × r
= 2 × 3,14 × 30
= 188,4 cm

c) r = 49 cm
L = π × r²
= 22/7 × 49 × 49
= 7.546 cm²
K = 2 × π × r
= 2 × 22/7 × 49
= 308 cm

d) d = 12 cm
r = 6 cm
L = π × r²
= 3,14 × 6 × 6
= 113,04 cm²
K = π × d
= 3,14 × 12
= 37,68 cm

e) d = 35 cm
r = 17,5 cm
L = π × r²
= 22/7 × 17,5 × 17,5
= 962,5 cm²
K = π × d
= 22/7 × 35
= 110 cm

f) d = 40 cm
r = 20 cm
L = π × r²
= 3,14 × 20 × 20
= 1.256 cm²
K = π × d
= 3,14 × 40
= 125,6 cm