Page 8 - Steady Matematik 2021 TG2 Buku B

Matematik Tingkatan 2 Bab 4 Poligon

F 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. x
120°
x 160°
110°
114°
110° 130°
120° 140°

145°

Hasil tambah sudut pedalaman Hasil tambah sudut pedalaman
Total sum of interior angles Total sum of interior angles
= (6 − 2) × 180° = (6 − 2) × 180°
= 720° = 720°
x + 110° + 120° + 145° + 90° + 114° = 720° x + 110° + 140° + 130° + 160° + 120° = 720°
x + 579° = 720° x + 660° = 720°
x = 141° x = 720° – 660°
= 60°

2. 3.
123° x x
170°
69° x
56° 100° x

Hasil tambah sudut pedalaman Hasil tambah sudut pedalaman
Total sum of interior angles Total sum of interior angles
= (4 − 2) × 180° = (6 − 2) × 180°
= 360° = 720°
x + 56° + 69° + 123° = 360° x + x + x + 100° + 90° + 170° = 720°
x + 248° = 360° 3x + 360° = 720°
x = 360° − 248° 3x = 360°
= 112° 360°
x =
3
= 120°

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