Tolong dijawab pakai cara ya THx

a) r = 14 cm
Luas = phi × r × r
= 22/7 × 14 × 14
= 22 × 2 × 14
= 44 × 14
= 616 cm2

b) r = 30 cm
Luas = phi × r × r
= 3,14 × 30 × 30
= 314 × 3 × 3
= 2,826 cm2

c) d = 14 cm r = 7 cm
Luas = phi × r × r
= 22/7 × 7 × 7
= 22 × 7
= 154 cm2

d) d = 30 cm r = 15 cm
Luas = phi × r × r
= 3,14 × 15 × 15
= 3,14 × 225
= 706, 5

a) - keliling lingkaran
= 2.Π.r
= 2. 22/7. 14
= 88cm
- luas lingkaran
= Π.r²
= 22/7. 14²
= 22/7. 196
= 616cm²

b) - keliling lingkaran
= 2.Π.r
= 2. 3,14. 30
= 6,28. 30
= 188,4 cm
- luas lingkaran
= Π.r²
= 3,14. 30²
= 3,14. 900
= 2.826 cm²

c) - keliling lingkaran
= Π.d
= 22/7. 14
= 44 cm
- luas lingkaran
= 1/4.Π.d²
= 1/4. 22/7. 14²
= 1/4. 22/7. 196
= 154 cm

d) - keliling lingkaran
= Π.d
= 3,14. 30
= 94,2 cm
- luas lingkaran
= 1/4.Π.d²
= 1/4. 3,14. 30²
= 1/4. 3,14. 900
= 706,5 cm²



Mohon maaf kalau salah