$\sqrt{2}\cos 20°$

$\frac{1}{2}\cos 40°$

$\frac{1}{\sqrt{2}}\cos 40°$

$\sqrt{3}\cos 20°$

-5

-6

x>5

x<5

3:4

3:5

4:5

4:6

1

-1

2

7

65/7

-65/7

30/7

$\alpha =45°$

$\alpha =0°$

$\alpha =90\mathbf{°}$

$\mathit{\alpha }\mathbf{=}\mathbf{180}\mathbf{°}$

25

30

20

15

2

8

6

-6

576 ft

288 ft

156 ft

160 ft

6

7

8

9

{4}

{2}

{5}

{3}

1

2

3

15

1020

252

140

15

11

10

9

n

M

mn

$n^3$

4

8

$\frac{1}{\sqrt{2}}$

$\sqrt{2}$

111001

110110

1010011

101101

1

3

2

6

x=3

x=5

y=-5

x=-5

27

9

3

7

22/9

26/7

29/7

28/5

-1

1/2

1

1

2

-1

(2,5)

(5,2)

(5,2)

(-2,5)

1/2

1

2