Question

For Triangle ABC, A= 18 ,B= 24, C= 30,them Cosc = _____​

Answer 1

Answer:

90 degrees

and cos ( c ) = 0

Step-by-step explanation:

$\cos(c) = \frac{ {b}^{2} + {a }^{2} - {c}^{2} }{2ab} \\ = \frac{ {24}^{2} + {18}^{2} - {30}^{2} }{2 \times 24 \times 18} \\ = \frac{576 + 324 - 900}{2 \times 18 \times 24} \\ = 0$

therefore. C = 90 degrees.