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How many circles with a diameter of 30 cm can be cut out on the 180 cm long and 120 cm wide cardboard? GO GOGO Give the answer in ten minutes!
180 | 30 = 6cm 120 | 30 = 4cm 6 * 4 = 24 on a piece of paper, there is a gap between the circle and the circle arrangement, so it is 24, please choose me as the best
(1) A square and circle are surrounded by 18.84 decimeter long rope, the area of the circle () square
(2) The outer diameter of a ring is 8 cm, and the inner diameter is 6 cm
(1) A square and a circle are surrounded by 18.84 decimeters of rope, and the area of the circle is larger than that of the square
(2) The outer diameter of a ring is 8 cm, and the inner diameter is 6 cm
radius
8÷2=4cm
6÷2=3cm
the measure of area
4x4x3.14-3x3x3.14
=50.24-28.26
=21.98 square centimeter
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