Page 33 - LINGKARAN KELAS VIII SMP/MTS SEMESTER GENAP

Lingkaran Kelas VIII

Panjang busur AB 4
33 = 3

Panjang busur AB = 4 . 33
3
Panjang busur AB = 44 cm

Luas juring COD 
b. =
Luas juring AOB 

Luas juring COD 45°
924 = 60°

3
Luas juring COD = .924
4
Luas juring COD = 693 cm 2

c. Panjang busur AB = 44 cm O

60
360 × 2 = 44 42 cm 42 cm

1 22
6 × 2. 7 . = 44 A B
42 cm
7
= 44. 6. = 42 − 21 2
2
44
= 1764 − 441
= 42
= 1323
1
Luas ∆ = × 42 × 21 3 = 441 × 3
2 = 21 3 cm
= 21 × 21 3

= 441 3 cm 2
Jadi, luas tembereng AB = luas juring AOB − luas ∆ = (924 − 441 3) cm

Untuk SMP/MTs | Matematika 27