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Grade 8 - Mathematics
3.51 Circles and Rings
Check the given statements are true or false.
: Circumference of a circle =
: Formula for area of ring =
: The semicircles of a circle are symmetric to diameter of a circle.
: To find the area of a ring, the two circles of that ring need not be concentric.
: If the radii of a ring are 10cm. and 5cm. respectively, then its area is 50 Sq.cm.
: Perimeter of a circle = (36/14)d.
: If the radii of a ring are 7 cm. and 2 cm. then the width is 5 cm.
: The angle at the center of circle is 330
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