Two circles of equal radius are located such that each circle passes through the centre of the other circle. Given that the radius of each circle is r units, find the perimeter of the shape formed by the two circles in terms of r units. (Ignore the dotted portions that lie within the circles.)

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TextCircumference of a Circle and Its Relation to Diameter

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In Fig. 6.13, we see points P and Q and two paths connecting them. The first path is made up of the semicircle a. The other path is made up of three semicircles (b, c and d). Which path is longer? Choose one: (i) Path a is longer. (ii) Path b + c + d is longer. (iii) The two paths have equal length.

TextCircumference of a Circle and Its Relation to Diameter

The perimeter of a circle is 44 cm. What is its radius?

TextCircumference of a Circle and Its Relation to Diameter