RRB NTPC CBT-1 previous year question
The sides of a triangle are 75 cm, 21 cm, and 72 cm. What is the length (in cm) of its altitude corresponding to the side with a length of 21 cm?
Asked in RRB NTPC 2026 — 16 June Shift 2 · Quantitative Aptitude
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Correct answer: (D) 72
Since 212+722=752, the triangle is right-angled with legs 21 and 72; the area = 1/2×21×72 = 756, so altitude to the 21 cm side = 2×756/21 = 72 cm.
हिंदी में प्रश्न
एक त्रिभुज की भुजाएं 75 cm, 21 cm और 72 cm हैं। 21 cm लंबाई वाली भुजा के संगत इसके शीर्षलंब की लंबाई (cm में) कितनी होगी?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (D) 72
चूंकि 212+722=752 है, त्रिभुज समकोण है जिसकी भुजाएं 21 और 72 हैं; क्षेत्रफल = 1/2×21×72 = 756, अतः 21 सेमी भुजा पर लंब = 2×756/21 = 72 सेमी है।
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