Circles. unfold. A. B. Fold. AB divides the circle into equal halves. AB is a diameter of the circle. O. A. B. C. Fold the paper circle in half in another way to obtain another diameter of the circle. The two lines meet at point O. O is the centre of the circle.
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AB divides the circle into equal halves.
AB is a diameter of the circle
Fold the paper circle in half in another way to obtain another diameter of the circle.
The two lines meet at point O.
O is the centre of the circle.
The line OC is the radius of the circle.
Circumference of a circle = d
Perimeter of a semi-circle = Radius + Diameter
= r + d
A circle is drawn on a 1-cm square grid.
Radius of circle = 10 cm
Area of quarter circle = 76 cm2
Area of circle = 4 x 72
= 304 cm2
Cut the circle into 24 equal pieces.
Rearrange 23 pieces like this.
Cut the last piece into halves and place one half at each end. The pattern looks like a rectangle.
Area of circle = r r
The figure below is formed by a semicircle and two quarter circle.
Area of the figure = 20 cm 10 cm
= 200 cm2
ACDF is a rectangle made up of 2 squares.
The figure shows semi-circles of equal areas at the sides of a square.
Four identical circles of diameter 10 cm are arranged in a big circle.