圆的认识 习题精选(国外英文资料).docVIP

圆的认识 习题精选(国外英文资料) I carefully collated documents, documents from the network I only collect and sort out In case of error Please check it yourself! Circle of knowledge, exercises, selections Fill in the blanks 1. in the same circle All radii are All diameters Diameter is radius The radius is in diameter The ratio of radius to diameter is 2. determine the position of the circle Determine the size of the circle 3. the two feet of the compasses are separated The distance between the feet is 2.5 centimeters So the radius of the circle is... Diameter is 4. the radius of the connecting line and the line at any point is called the circle Alphabetic Its length is when painting circles Distance 5. pass the center of the circle And the line at both ends on the circle is called Alphabetic 6. fill in or = = (1) a circle with a diameter of 6 cm, a radius of 3 cm (2), a radius of 5 cm, a circle of 10 cm in diameter (3) a circle of 4 cm in diameter, 9 cm in diameter, (4) in diameter, 8 meters in diameter, a circle of 6 meters in radius (5) a circle of 8 cm in diameter, 9 cm in diameter, (6) in diameter, 6 meters in diameter, and 4 meters in diameter 7. expand the radius of a circle by 2 times Then the diameter of the circle is enlarged twice 8. fill in the form Radius R (m) Seven Two point five Four point five Zero point three five Zero point one two Diameter D (m) Eight One point two Zero point six Zero point six two 9. calculation (1) diameter D R=6.2 cm r=30 cm r=0.36 m r=2.4 m r=3.56. D=, d=, d=, d=, d= (2) radius r D=0.63 m d=1.1 m d=5.4 m d=9 d=15 cm. R=, r=, r=, r=, r= Two, judgment The 1. radius or diameter determines the position of the circle () The longest line in the 2. circle is the diameter () The radius of the 3. circle is increased by 1 centimeters Its diameter is increased by 2 centimeters () 4. diameter is the line segment with both ends on the circle () The 5. radius must be shorter than the diameter () The 6. radius is the straight line from the center