Page 275 - Matematik Tambahan Tingkatan 4 KSSM
P. 275
Penyelesaian Segi Tiga
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T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T
TULIS JURNAL ANDA
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1. Lukis carta alir yang menunjukkan langkah-langkah yang anda gunakan untuk memilih
petua yang sesuai digunakan bagi mencari
(a) panjang sisi atau saiz sudut sebuah segi tiga,
(b) luas sebuah segi tiga.
2. Layari Internet untuk mendapatkan
(a) contoh-contoh penggunaan petua sinus, petua kosinus dan rumus luas segi tiga dalam
kehidupan seharian,
(b) luas Segi Tiga Emas Kuala Lumpur, Segi Tiga Emas India dan Segi Tiga Bermuda.
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LATIHAN PENGUKUHAN
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1. (a) Diberi ∠ABC = 50°, ∠BAC = 72° dan c = 5.8 cm, hitung panjang a dan b. TP1
(b) Diberi sisi-sisi segi tiga PQR ialah p = 8.28 cm, q = 6.56 cm dan r = 3.63 cm,
cari ∠P, ∠Q dan ∠R. TP2
2. Cari nilai x dalam setiap rajah berikut. TP3
(a) (b) P
X 3 cm 6 cm
x cm Q
14 cm S
9 cm
55°13ʹ 31°52ʹ Z
Y x cm 77°
R
3. Rajah di sebelah menunjukkan segi tiga bersudut tegak ABC. A
Titik D terletak di atas AB. Hitung TP3
(a) panjang AC, 7 cm
(b) luas segi tiga ADC.
D 10 cm
3 cm
B C
4.
4. Diberi segi tiga XYZ dengan keadaan ∠X = 42.2°, x = 10 cm dan z = 13.4 cm. TP4
(a) Lakarkan dua bentuk segi tiga yang mungkin.
(b) Seterusnya cari ∠Z yang mungkin.
BAB 9
(c) Hitung luas segi tiga XYZ untuk ∠Z yang cakah.
5. Rajah di sebelah menunjukkan lima titik, A, B, C, D
5. A
dan E yang membentuk sisi empat. BCD ialah garis 9 cm 10 cm
lurus, ∠ACB adalah cakah dan luas segi tiga ADE 5 cm E
2
ialah 20 cm . Hitung TP4 30°
(a) panjang AD, B C 6 cm D
(b) ∠DAE.
267

