Tolong dijawab no 3&4 bsk dikumpulin

3.
Keliling = π × d
= 22/7 × 21
= 66 cm

Luas = 1/4 × π × d × d
= 1/4 × 22/7 × 21 × 21
= 346,5 cm²

4.
Keliling = π × d
= 3,14 × 30
= 94,2 cm

Luas = 1/4 × π × d × d
= 1/4 × 3,14 × 30 × 30
= 706,5 cm²

3. K= πd
=22/7×21
=6cm
L= πrkuadrat
=3.14×10.5×10.5
=346.185
Maaf cuma bisa segitu