a business card that is 9cm in height and 5cm in width
a business card that is 9 by 5 centimeters
「縦９cm、横５cmの名刺」は
ーa business card that is 9cm in height and 5cm in width
ーa business card that is 9 by 5 centimeters
のように言えます。
例：
I just got some beautiful new business cards that are 9 by 5 centimeters.
「縦９cm、横５cmの綺麗な新しい名刺を購入した」
ご参考まで！
A business card that’s 9 centimeters by 5 centimeters.
・A business card that’s 9 centimeters by 5 centimeters.
・A 9 cm by 5 cm business card.
・The card measures 9 cm by 5 cm.
「縦9cm×横5cmの名刺」は、英語では **“9 centimeters by 5 centimeters”**（または短く “9 cm by 5 cm”）と言います。
会話でもビジネスでも自然に使える言い方です。
カナダ 
アメリカ合衆国 
