Closed curves Simple Closed Curves Simple closed curves made of line segments.

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Aim: To understand and know the vocabulary for parts of a circle

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Presentation transcript:

Closed curves Simple Closed Curves Simple closed curves made of line segments

WHAT IS A CIRCLE ? A CIRCLE IS A LOCUS OF A POINT WHICH ARE EQUIDISTANT FROM THE FIXED POINT

CONSTRUCTION OF A CIRCLE

CIRCULAR SHAPED OBJECTS Medal Coins Clock Plate Tube Key hole Ring Top APPLICATION

PATTERNS IN CIRCLES TOOTHED WHEEL GRINDING WHEEL FAN DESIGNED WHEEL COLOUR WHEEL PATTERN OF A CIRCLE

Did you know we can draw a number of chords to the circle? Can you guess which is the longest chord? O A B C D E F G

RADII OF THE CIRCLE We can draw a number of radii to the circle. All the radii are of equal length. A C DE F B O

The length of the diameter is always twice the length of the radius.

FIND ME WITH THE GIVEN CLUES IN THE LETTER MAZE LOOK VERTICALLY HORIZONTALLY AND DIAGONALLY I measure half of the diameter. What is the name given to me? I am the distance around the circle. What am I called? I lie in the middle of the circle. Who am I? I pass through the centre and touch two ends of the circumference. What is my name? I am a line segment and my end points lie on the circle. Can you guess the name given to me?

ABCDEFGHIJRLM CIRCUMFERENCE MNREOPQRTSTHU VWDNXYZEABCOD EFITGHMIJKLRM NOURPAQRSTUDV WXSEIYRADIUSF GHIDJKLMNOPQR

RESOURCE MATERIAL C.B.S.E. MATHEMATICS TEXT BOOKS OF CLASSES V, VI, VII Encarta 2000