Page 9 - Steady Matematik 2021 TG2 Buku B

Matematik Tingkatan 2 Bab 4 Poligon

G Cari nilai x bagi setiap poligon yang berikut. TP 3 ARAS S
Find the value of x for each of the following polygons.

Contoh 1. 2.
100° 80°
150° x
100°
x 140° 60°

x
140°

x + 100° + 150° = 360° x + 80° + 140° + 60° = 360°
x + 100° + 140° = 360° x + 280° = 360°
x + 250° = 360°
x + 240° = 360° x = 360° − 280°
x = 360° − 250°
x = 360° − 240° = 80°
= 110°
= 120°
Contoh 3. 4. 85° x
x

x 110°

150° 50° 130° 80° 100°

x + 130° + 100° = 360° x + 85° + 100° + 70° = 360°
x + 150° + 130° = 360° x + 230° = 360° x + 255° = 360°
x + 280° = 360° x = 360° − 230° x = 360° − 255°
x = 360° − 280° = 130° = 105°
= 80°

Contoh 5. 6.

x
x
x x 50° x

65° 75°
100° x
50°

x + x + 65° + 75° + 50° = 360° 5x = 360°
x + x + x + 50° + 100° = 360° 2x + 190° = 360° 360°
3x + 150° = 360° 2x = 360° − 190° x = 5
3x = 360° − 150° = 170° = 72°
3x = 210° 170°
210° x =
x = 2
3 x = 85°
x = 70°

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