1.5 Trigonometry

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Question 41

In triangle $D E F$ , $5\text{cm}$ and $6\text{cm}$ . Given that $sin⁡(∠DEF)=23\displaystyle \sin(\angle DEF) = \frac{2}{3}$ and $\angle DEF\,$ is acute.

a.

Find the exact value of $cos⁡(∠DEF)\cos(\angle DEF)$

[2]

b.

Find the length of $D F$ .

[4]

c.

Find $∠EFD\angle EFD$ .

[3]

1.5 Trigonometry

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Question 41

In triangle $D E F$ , $5\text{cm}$ and $6\text{cm}$ . Given that $sin⁡(∠DEF)=23\displaystyle \sin(\angle DEF) = \frac{2}{3}$ and $\angle DEF\,$ is acute.

a.

Find the exact value of $cos⁡(∠DEF)\cos(\angle DEF)$

[2]

b.

Find the length of $D F$ .

[4]

c.

Find $∠EFD\angle EFD$ .

[3]

1.5 Trigonometry

Question 41

1.5 Trigonometry Questions

1.5 Trigonometry

Question 41

1.5 Trigonometry Questions