Question 1 If the area of a circle is equal to the sum of the areas of two circles of diameters 10 cm and 24 cm, then diameter of the larger circle (in cm) is (A) 34 (B) 26 (C) 17 (D) 14
Now,
Area of 5 cm circle + Area of 12 cm circle = Area of circle with radius r
š(5)2 + š(12)2 = šr2
52 + (12)2 = r2
25 + 144 = r2
169 = r2
r2 = 169
r = ā169
r = ā("132" )
r = 13 cm
Thus,
Diameter = 2 Ć 13 = 26 cm
So, the correct answer is (B)
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Davneet Singh
Davneet Singh is an IIT Kanpur graduate and has been teaching for 16+ years. At Teachoo, he breaks down Maths, Science and Computer Science into simple steps so students understand concepts deeply and score with confidence.
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