एक मॉडल में (a+b+c) भुजा वाले वर्ग को अलग भागों में बाँटा गया। कुल क्षेत्रफल में कौन-सा पद अवश्य आएगा?
A model divides a square of side (a+b+c) into parts. Which term must appear in the total area?
Explanation opens after your attempt
A. ( 2ab+2bc+2ca )
Concept
Because of three pairs of rectangles, (2ab), (2bc) and (2ca) appear. In exams, count each pair twice.
Why this answer is correct
The correct answer is A. ( 2ab+2bc+2ca ). Because of three pairs of rectangles, (2ab), (2bc) and (2ca) appear. In exams, count each pair twice.
Exam Tip
तीन जोड़ी आयतों के कारण (2ab), (2bc) और (2ca) आते हैं। परीक्षा में हर जोड़ी दो बार गिनें।
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