Question

If cos ⁡x=−4/5, and π

Answer 1

SOLUTION:

cos x= -4/5 = b/h = k

Therefore,

b = -4k

h = 5k

Hence, By Pythagoras theorem:

p = √{(5k)²-(-4k²)}

p = √{25k²-16k²}

p = √{9k²}

p = 3k

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Note:

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Answer 2

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If cos ⁡x=−4/5, and π

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cos x= -4/5 = b/h = k

Therefore,

b = -4k

h = 5k

Hence, By Pythagoras theorem:

p = √{(5k)²-(-4k²)}

p = √{25k²-16k²}

p = √{9k²}

p = 3k