Question

Помогите пожалуйста!!)
cosB
sinB

Answer 1

Ответ:

по теореме Пифагора АВ=

${ab}^{2} = {cb}^{2} + {ac}^{2}$

${ab}^{2} = {135}^{2} + {72}^{2}$

${ab}^{2} = 18225 + 5184$

${ab}^{2} = 23409$

$ab = 153$

$cos(b) = frac{bc}{ab}$

$cos(b) frac{135}{152}$

$cos(b) = 0.88$

$sin(b) = frac{ac}{ab}$

$sin(b) = frac{72}{152}$

$sin(b) = frac{9}{19}$