Determine sin A and cos A, to the nearest tenth.?

👨🏻‍🏫 學術台數學

[匿名]

2017-05-10 12:52 am

回答 (4)

不用客氣

2017-05-10 1:03 am

✔ 最佳答案

sinA
= (opposite side) / hypotenuse
= BC / AC
= 10/25
= 0.4

cosA
= (adjacent side) / hypotenuse
= AB/AC
= 20/25
= 0.8

The answer: D. sinA = 0.4; cosA = 0.8

However, this question goes WRONG.
This is because a triangle with sides 10, 20 and 25 is NOT a right-angled triangle.

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