Question

CA = 35 см,
CB = 84 см.
AB = [ ]см
(дроби скорочуй)
sin∠B=
cos∠B=

Answer 1

По теореме Пифагора

$AB^{2} =BC^{2} +AC^{2} \\AB^{2} = 8281\\AB = \sqrt{8281} = 91$см.

$sin\beta =\frac{AC}{AB} =\frac{35}{91}=\frac{5}{13}$

$cos\beta =\frac{CB}{AB} =\frac{84}{91} =\frac{12}{13}$