Eric Nicholas K's answer to LockB's Secondary 3 A Maths Singapore question.
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The list of the special angles 0, 30, 45, 60 and 90 which you must memorise; we can get 45 from an isosceles right-angled triangle with angles 45 and short sides 1 unit each, while we can get 30 and 60 from an equilateral triangle being cut into two equal right angled triangles.
Date Posted:
3 years ago