Question

Hitunglah luas lingkaran !

jari-jari 28 cm, phi 22/7

jari-jari 14 cm, phi 22/7

jari-jari 42 cm,phi 22/7

jari-jari 35 cm,phi 22/7

jari-jari 8 cm, phi 3,14

Answer 1

R=28 cm, phi = 22/7 jwb phi×jari2 ² =22/7×28×28=2464 cm²

Answer 2

1. 22/7x 28 x 28
= 22 x 4 x 28
= 88 x 28
= 2464 cm2
2. 22 /7x 14x14
= 22 x 2 x 14
= 44 x 14
= 616 cm2
3. 22/7x 42 x 42
= 22 x 6 x 42
= 132 x 42
= 5544 cm2
4. 22/7x 35x35
= 22x5x35
=110x35
= 3850 cm2
5. 3.14 x8x8
=25.12 x 8
=200.96 cm2