Page 8 - Matematik Tg2_Praktis Topikal A+_Pan Asia Publications

3. Hasil tambah sudut peluaran suatu poligon ialah 360°.
The sum of exterior angles of a polygon is 360°.
4. Sudut pedalaman = Hasil tambah sudut pedalaman / Interior angle = Sum of interior angles
Bilangan sisi Number of sides

360° 360°
5. Sudut peluaran = / Exterior angle =
Bilangan sisi Number of sides

©PAN ASIA PUBLICATIONS
3. Lengkapkan jadual di bawah./Complete the table below. TP3
Hasil tambah sudut
Poligon sekata Bilangan sisi (n) Bilangan segi tiga
Regular polygon Number of sides (n) Number of triangles pedalaman
Sum of interior angles

Contoh (3 – 2) × 180°
Segi tiga 3 1 = 180°
Triangle
(a) Sisi empat 4 2 (4 – 2) × 180°
Quadrilateral = 2 × 180° = 360°

(b) Pentagon 5 3 (5 – 2) × 180°
= 3 × 180° = 540°
(c) Heksagon 6 4 (6 – 2) × 180°
Hexagon = 4 × 180° = 720°
(d) Heptagon 7 5 (7 – 2) × 180°
= 5 × 180° = 900°

4. Hitung nilai p bagi rajah yang berikut. TP3
Calculate the value of p for the following diagrams.
Contoh (a) 70°
160°
p p 40°
130°
100° 140°
120°
Hasil tambah sudut pedalaman
p Sum of interior angles
100° = (6 – 2) × 180°
= 720°
Hasil tambah sudut pedalaman
Sum of interior angles p + 70° + 160° + 40° + 140° + 100° = 720°
= (n – 2) × 180° p + 510° = 720°
= (5 – 2) × 180° p = 210°
= 540°
p + p + 130° + 120° + 100° = 540°
2p + 350° = 540°
2p = 190°
p = 95°

27