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प्रश्न
The radii of the two circles are 4 cm and 3 cm respectively. The diameter of the circle having an area equal to the sum of the areas of the two circles (in cm) is ____________.
विकल्प
5
7
10
14
MCQ
रिक्त स्थान भरें
उत्तर
The radii of the two circles are 4 cm and 3 cm respectively. The diameter of the circle having an area equal to the sum of the areas of the two circles (in cm) is 10.
Explanation:
`pi "R"^2 = pi "r"_1^2 + pi "r"_2^2`
`= pi ["r"_1^2 + r_2^2]= pi [4^2 + 3^2]`
`=> "R"^2 = 25 => "R" = 5 "cm"`
d = 5 x 2 = 10 cm
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