Question

помагитеееее а) cos a-?​

Answer 1

А) cos a = 12/13

Ә) cos β = 4/5 = 0,8

Б)

$c = \sqrt{ {6}^{2} + {8}^{2} } = \sqrt{100} = 10$

В)

$b = \sqrt{ {26}^{2} - {24}^{2} } = \sqrt{100} = 10$

Г)

$c = \sqrt{ {12}^{2} + {16}^{2} } = \sqrt{400} = 20$

Ғ)

$c = \sqrt{ {9}^{2} + {12}^{2} } = \sqrt{225} = 15$

Д)

$x = 6 \times ctg {30}^{0} = 6 \times \frac{ \sqrt{3} }{3} = 2 \sqrt{3}$

Е)

$x = 10 \times \cos {30}^{0} = 10 \times \frac{ \sqrt{3} }{2} = 5 \sqrt{3}$

Ж)

$AB = \sqrt{ {5}^{2} + {12}^{2} } = \sqrt{169} = 13$

Р = 13 + 13 + 5 + 5 = 36

3)

$AB = 5 \sqrt{2} \times \sqrt{2} = 5 \times 2 = 10$

CD = 10/2 = 5