Given a rectangular ABCD.A’B’C’D’. Its base is a rectangular with BD = 5 cm; AB = 3cm. The lateral area of this rectangular box if BC’ = √41 cm

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1. Đáp án:

    

   Giải thích các bước giải:

   Phythagorean theorem:

   ⇒ BD²=AB²+AD²

   ⇒AD²=BD²-AB² = 5² – 3²=16

   ⇒AD=√16=4 (cm)

   BC=AD=4 (cm)

   Phythagorean theorem:

   ⇒CC’=√BC’²-BC²=4√2 (cm)

   The lateral area of this rectangular:

   2CC’.(BC+AB)= 56√2 (cm²)

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