NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 9: Perimeter and Area - Multiple Choice QuestionsQuestion 30
Class 7 - Mathematics - Unit 9: Perimeter and Area - Multiple Choice Questions
Question. 30
30. If radius of a circle is increased to twice its original length, how much will the area of the circle increase?
(a)
(a) 1.4 times
(b)
(b) 2 times
(c)
(c) 3 times
(d)
(d) 4 times
Detailed Answer with Explanation:
Area ∝ r².
If r is doubled, area becomes 4 times original, increase = 3 times.