DGA 1 QUIZ 3 TRIGONOMETRY 4 SEPT 2021

Based on figure 1, what is the ratio of  $\sin\ \theta$  ?

[Berdasarkan figure 1, apakah nisbah bagi  $\sin\ \theta$  ?]

•  $\frac{7}{25}$  

•  $\frac{24}{25}$  

•  $\frac{24}{7}$  

•  $\frac{25}{7}$  

 $\sec45\degree=$  
hint :  $\sec\theta=\frac{1}{\cos\theta}$  

• 0.7071

• 1.4142

• 1

• 0

 $\cos^{-1}0.7523=$  

•  $37\degree$  

•  $48.8\degree$  

•  $1\degree$  

•  $41.2\degree$  

Based on the diagram, find the length of AC by using cosine rule.
[Berdasarkan kepada gambarajah, cari panjang AC dengan menggunakan petua cosine.]
Formula :  $b^2=a^2+c^2-2ac\ Cos\ B$  

• 4434.19 cm

• 66.59 cm

• 28.53 cm

• 72 cm

Based on the diagram, find the area of triangle ABC.
[Berdasarkan gambarajah, cari luas segitiga ABC.]
Formula : 

 $Area=\frac{1}{2}ac\ \sin\ B$  

• 640 cm

• 905.10 cm

• 452.55 cm

• 138