sine

/saɪn/ (bre, ipa) · /saɪn/ (ame, ipa) · /ˈsīn/ (ame, mw)

sine — noun

  • sinesingular
  • sinesplural

1. For a triangle containing a 90° corner, the sine of a smaller angle is the numbe

1.名詞B1
釋義

For a triangle containing a 90° corner, the sine of a smaller angle is the number that results from dividing the opposite side's length by the longest side's length.

例句

To find the sine of an angle in a right triangle, divide the opposite side by the hypotenuse.

sine of [angle] = opposite ÷ hypotenuse

Mei calculated the sine of 30 degrees and got 0.5, just as her textbook said.

sine of [angle] = numerical value

同義詞
  • sin

    Standard abbreviation used in formulas and on calculators; identical meaning.

用法筆記

Mainly used in geometry and trigonometry contexts. The sine function also appears in physics and engineering for describing wave patterns.

常見錯誤

❌Use sine to find a side of any triangle.
✅Use sine only when you have a right-angled triangle.
💡Sine is defined using a right angle; it does not apply directly to other triangles.