Question
[38]. A cubical wooden box with edge 7 cm is to be painted on all six faces, with no face left unpainted. What total area will be painted? / किनारा 7 सेमी वाले घनाकार लकड़ी के डिब्बे को सभी छह फलकों पर रंगा जाना है, बिना कोई फलक बिना रंगा छोड़े। कुल कितना क्षेत्रफल रंगा जाएगा?
Option 4 : 294 sq cm
Detailed Solution
सही उत्तर 294 sq cm है।
Surface area = 6 × (edge)² = 6 × 7² = 6 × 49 = 294 sq cm. / पृष्ठीय क्षेत्रफल = 6 × (किनारा)² = 6 × 7² = 6 × 49 = 294 वर्ग सेमी।
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prepsnap.in • Mock TestQuestion:
[38]. A cubical wooden box with edge 7 cm is to be painted on all six faces, with no face left unpainted. What total area will be painted? / किनारा 7 सेमी वाले घनाकार लकड़ी के डिब्बे को सभी छह फलकों पर रंगा जाना है, बिना कोई फलक बिना रंगा छोड़े। कुल कितना क्षेत्रफल रंगा जाएगा?
Correct Answer: 294 sq cm
Surface area = 6 × (edge)² = 6 × 7² = 6 × 49 = 294 sq cm. / पृष्ठीय क्षेत्रफल = 6 × (किनारा)² = 6 × 7² = 6 × 49 = 294 वर्ग सेमी।