Page 11 - Steady Matematik 2021 TG2 Buku B

Matematik Tingkatan 2 Bab 4 Poligon

Contoh 3. Sudut pedalaman / Interior angle 4. Sudut pedalaman / Interior angle
= 120° = 150°
Sudut pedalaman / Interior angle
= 108° Sudut peluaran / Exterior angle Sudut peluaran / Exterior angle
= 180° − 120° = 180° − 150°
Sudut peluaran / Exterior angle = 60° = 30°
= 180° − 108°
= 72° n = 360° n = 360°
60° 30°
360°
n = = 6 = 12
72°
= 5

Contoh 5. Hasil tambah sudut pedalaman 6. Hasil tambah sudut pedalaman

Total sum of interior angles Total sum of interior angles
Hasil tambah sudut pedalaman = 2 340° = 2 520°
Total sum of interior angles
(n − 2) × 180° = 2 340° (n − 2) × 180° = 2 520°
= 1 980°
2 340° 2 520°
n − 2 = n − 2 =
(n − 2) × 180° = 1 980° 180° 180°
1 980°
n − 2 = n − 2 = 13 n − 2 = 14
180° n = 15 n = 16
n − 2 = 11
n = 13

J Hitung bilangan sisi bagi setiap poligon sekata yang tidak lengkap. TP 4 ARAS R
Calculate the number of sides of each incomplete regular polygon.

Contoh 1. 2.
20°

60° 10°
360°
n =
20° 360°
n =
360° = 18 10°
n =
60° = 36
= 6

Contoh 3. 4.

108° 140°
165°

360°
n = 360° 360°
180° – 165° n = n =
180° – 108° 180° – 140°
360°
= 360° 360°
15° = =
72° 40°
= 24
= 5 = 9

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