Area and Perimeter practice question for Railways, SSC. Review the correct answer and explanation, then continue with related practice below.
The radius of a circle is increased so that its area increases by 69%. Find the percentage increase in its circumference.
एक वृत्त की त्रिज्या इस प्रकार बढ़ाई जाती है कि उसके क्षेत्रफल में 69% की वृद्धि हो जाती है।
उसकी परिधि में कितने प्रतिशत की वृद्धि होगी?
Answer and explanation are free to read — no sign-in required.उत्तर और व्याख्या पढ़ने के लिए साइन-इन आवश्यक नहीं है।
Correct Answerसही उत्तर
B. 30%
Explanationव्याख्या
New area factor = 1.69.
Therefore, radius factor = √1.69 = 1.3.
Circumference is proportional to radius, so it increases by 30%.
नया क्षेत्रफल गुणक = 1.69।
अतः त्रिज्या का गुणक = √1.69 = 1.3।
इसलिए परिधि में 30% वृद्धि होगी। ---
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