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
π(5)2 + π(12)2 = πr2
52 + (12)2 = r2
25 + 144 = r2
169 = r2
r2 = 169
r = β169
r = β("132" )
r = 13 cm
Thus,
Diameter = 2 Γ 13 = 26 cm
So, the correct answer is (B)

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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