theta
theta — 名詞
1. Θ (uppercase) and θ (lowercase) are the capital and small forms of the eighth ch
西塔
希臘字母第八個（Θ/θ）
Θ (uppercase) and θ (lowercase) are the capital and small forms of the eighth character in the Greek writing system. This letter is widely used as a symbol in mathematics and science — for example, to label an unknown angle in geometry or to represent temperature in physics.
Mathieu learned that the Greek letter θ stands for an unknown angle in geometry.
Mathieu 學到希臘字母 θ 在幾何學中代表一個未知的角度。
symbol for an angle in geometry
In physics class, Naoko used theta to mark the temperature in her formula.
在物理課上，Naoko 用 theta 來標示她公式中的溫度。
used for temperature in physics
Theta comes between eta and iota in the Greek alphabet.
Theta 在希臘字母順序中介於 eta 與 iota 之間。
A small θ was drawn on the diagram next to the angle that Selim needed to find.
Selim 需要找到的角旁邊，圖表上畫了一個小小的 θ 作為標記。
Before solving the equation, Minh checked which symbol stood for theta.
在解方程式之前，Minh 先確認了哪個符號代表 theta。
文法句型
theta + verb (singular)
用法筆記
Pronounced /ˈθiːtə/ (THEE-tuh) in both American and British English. The 'th' sound at the start does not exist in Mandarin or many other Asian languages, so learners often need extra practice saying it. In mathematics, θ is routinely used to label an unknown angle in trigonometry and geometry. In physics, lowercase θ often stands for temperature or an angle, while uppercase Θ may represent a thermodynamic quantity.