If the sine of 42 is approximately 0.6691. Which of the following has a COSINE approximately 0.6691?

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Ответ:

vontaeofficial5176

12.05.2020

Mathematics

A = 8

Step-by-step explanation:

$A = a^{2} \\\\a^{2} + b^{2} = c^{2} \\\\a = b \\------\\\\a^{2} + a^{2} = c^{2} \\\\2 * a^{2} = c^{2} \\\\a = \sqrt{\frac{c^{2}}{2} } \\\\a = \sqrt{\frac{4^{2}}{2} } \\\\a = \sqrt{\frac{16}{2} } \\\\a = \sqrt{8} \\\\\\A = a^{2} = (\sqrt{8})^{2} = 8$

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