Page 6 - Matematik Tam_Modul A+_Pan Asia Publications

2. Hitung jejari, j, bagi setiap yang berikut.
Calculate the radius, j, for each of the following. TP 2
(a)
Contoh/Example
24.5 cm
10.2 cm
P Q
2.5 rad
j 1.5 rad
O
SP 1.2.1 j = 10.2 cm P j = 24.5 Q
j
O
1.5
2.5
= 6.8 cm = 9.8 cm

(b) (c)
15.7 cm
Q
j
0.7 rad
30.5 cm O P
P O Q
j
3.1 rad
15.7
j = (2π – 3.1)
j = 30.5
2π – 0.7 = 4.93 cm
= 5.46 cm

3. Hitung sudut dalam radian bagi setiap yang berikut.
Calculate the angle in radians for each of the following. TP 2

Contoh/Example

Gunakan / Use s = jq Tip
SPM
14 cm ©PAN ASIA PUBLICATIONS
16 = 14q
θ 16 cm 16 Simbol q dibaca sebagai “teta”.
q =
14 The symbol q is read as “teta”.
= 8 rad Tip SPM
7
(a) (b)
P
P 30.2 cm
12.3 cm
12 cm
θ O θ
O
7.5 cm
Q
q = 12.3
7.5 Q
= 1.64 rad q = 30.2
12
= 2.52 rad
(c) P (d)
Q 2π – q = 35 Q
θ 11
11 cm q = 2π – 35 5 cm
O 11 θ θ
= 3.1 rad θ O P
π
q = rad
35 cm 3

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