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As shown in the figure, C is the midpoint of line AB and D is the midpoint of line AC. given that the sum of the lengths of all line segments in the figure is 23, the length of line AC is calculated A———D———C——————B It's due this afternoon. Hurry up
b. Are. C all line segments
In order to cut out four pieces of circular iron with the same size, which are cut out of each other, what is the maximum diameter of the piece?
Let R be the radius of each of the following four circumscribed circles, then the distance between the centers of two adjacent circles is 2R, and the distance between the centers of two relative circles is 4 * radical 2 * r^
Radius of iron sheet = center distance of two relative circles + 2 * r
That is r
A piece of iron sheet in the shape of a right triangle, with the right side length of 40cm and 60cm respectively, is cut into a rectangle, and the right angle of the triangle is taken as an angle of the rectangle. How can we cut the remaining scrap to a minimum?
As shown in the figure. Let AC = 40, BC = 60. Then the equation of the straight line AB is X40 + Y60 = 1. Let e (x, y), then X40 + Y60 = 1. (0 < x < 40, 0 < y < 60).. 1 ≥ 2x40 · Y60 is changed to XY ≤ 600. If and only if X40 = Y60 = 12, that is, x = 20, y = 30, the equal sign will be taken. S rectangle cdef = XY ≤ 600
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