The radii of concentric circles are 42 cm. and 35 cm. What will the area between these circles./संकेन्द्रीय वृत्तों की त्रिज्यायें 42 सेमी. और 35 सेमी. है। इन वृत्तों के बीच वाले स्थान का क्षेत्रफल क्या होगा ?

Area between concentric circles = π(R² - r²) where R = 42 cm (outer radius) and r = 35 cm (inner radius). Area = π(42² - 35²) = π(1764 - 1225) = π(539) = 1693.46 ≈ 1694 cm². Option A (3850) is close to π×35² which would be the inner circle area. Option C (1925) is close to π×42² which would be the outer circle area. Option D appears to be a miscalculation.