Question

Сделайте 3 и 4, я отметила круглешком. И без никаких бесполезных ответов бан, и у вас отнимут Нуж">

Answer 1

Объяснение:

3.

β = 180° - 90° - α = 90° - 42° = 48°

$sin \alpha =\frac{a}{c\\}\\ \\a = c * sin\alpha \\\\a = 10 * sin42=10*0,669 =6,69$

$sin\beta = \frac{b}{c} \\\\b = c * sin\beta \\\\b= 10 * sin 48 = 10 * 0,743 = 7,43$

$cos\alpha =\frac{b}{c\\}\\ \\b = c * cos\alpha \\\\a = 10 * cos42=10*0,743 =7,43$

$cos\beta =\frac{a}{c\\}\\ \\a = c * cos\beta \\\\a = 10 * cos48=10*0,669 =6,69$

4.

α = 180° - 90° - β = 90° - 18° = 72°

$sin\beta = \frac{b}{c} \\\\c=\frac{b}{sin\beta }\\\\c= \frac{4}{sin18} =\frac{4}{0,31} =12,9$

$sin\alpha = \frac{b}{c} \\\\a=c*sin\alpha \\\\a=12,9 * sin72 =12,9 * 0,95 = 12,27\\$

$cos\alpha = \frac{b}{c} \\\\c=\frac{b}{cos\alpha}\\\\c= \frac{4}{cos72} =\frac{4}{0,31} =12,9$

$cos\beta = \frac{b}{c} \\\\a=c*cos\beta \\\\a=12,9 * cos18 =12,9 * 0,95 = 12,27\\$