In △ ABC, ∠ ACB = 90 °, CD is the height of edge AB, AC = 15, BC = 20, find the length of AD and BD ditto!

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• 3. 1. A pair of mainly refers to "a pair; a pair", which is composed of two parts______ Number form______ It can be singular or plural 2. When the phrase "... A pair (s) of" is used as the subject, the singular and plural forms of the predicate verb should be written in Chinese______ The singular and the plural of 3. The nouns after a pair of can be modified with adjectives, which are often placed before pair________ . This pair of jeans is very good This _____ ______ ______ ______ very good. These two new soft sports shoes are my uncle's The ______ ______ ______ _______ _______ _______ my uncle's.
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