how is 10*cosine 30=.866? I thought cosine 30= 1/2

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622

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Guest Nov 22, 2014

+118608

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Best Answer

I don't memorise those ratios. I have 'memorised' this triangle.

It is an equilateral triangle of side length 2 that has been split down the middle.

You can 'see' that cos 30 = sqrt3/2

Melody Nov 22, 2014

Melody · Answer 1 · 2014-11-22T06:09:45

I don't memorise those ratios. I have 'memorised' this triangle.

It is an equilateral triangle of side length 2 that has been split down the middle.

You can 'see' that cos 30 = sqrt3/2

CPhill · Answer 2 · 2014-11-22T06:06:04

No...the sine of 30 (degrees) = 1/2 !!!

10*cos(30) = about 8.66