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तीन घनों, जिनमें प्रत्येक की भुजा 5 सेमी है, के संलग्न फलकों को मिलाकर एक घनाभ बनाया जाता है। इससे प्राप्त धनाभ का पृष्ठीय क्षेत्रफल ज्ञात कीजिए।

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तीन घनों, जिनमें प्रत्येक की  भुजा = 5 सेमी

तब, घनाभ की मांपें क्रमशः

लम्बाई l = 5 + 5 + 5 = 15 सेमी, चौड़ाई b = 5 सेमी तथा ऊँचाई h = 5 सेमी

अतः घनाभ का पृष्ठीय क्षेत्रफल = 2(lb + bh + hl)

= 2(15 x 5 + 5 x 5 + 5 x 15)

= 2(75 + 25 + 75)

= 2 x 175 = 350 सेमी2

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