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ZX-855BD5F6732026年8月国际B卷 · 第 19 题
2026年8月国际B卷 · 原库模块 2 · Q19 参考答案
In triangle RST, angle T is a right angle, point L lies on \( RS \), point K lies on \( ST \), and \( LK \) is parallel to \( RT \). If the length of \( RT \) is 63 units, the length of \( LK \) is 21 units, and the area of triangle RST is 252 square units, what is the length of \( KT \), in units?
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