A chord of the larger among two concentric circles is of length 20 cm and it is tangent to the

Описание: A chord of the larger among two concentric circles is of length 20 cm and it is tangent to the smaller circle. What is the area (in cm2) of the annular portion between the two circles?

दो संकेंद्रित वृत्तों में से बड़े वृत्त की एक जीवा की लंबाई 20 सेमी है और यह छोटे वृत्त की स्पर्शरेखा है। दोनों वृत्तों के बीच के वलयाकार भाग का क्षेत्रफल (सेमी2 में) क्या है?

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