190124 还原机经选题: 文字题&几何
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The pulley has three wheels A, B and C. Circle A has a radius of 2. Circle B has a radius of 4. Circle C has a radius of 6. If circle A rotates 1.5 turns counterclockwise, how many turns does circle B and circle C rotate in total?
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190124 还原机经选题: 文字题&几何
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In rectangular ABCD, ab = 10, BC = 6. What is the area of the blank area?
1:l=0.8
2:∠d=45°
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190124 还原机经选题: 文字题&几何
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The area of regular hexagon is $$54\sqrt{3}$$. What is the circumference of the regular hexagon?
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190124 还原机经选题: 文字题&几何
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In quadrilateral ABCD, ∠BAD=90°, ∠ABC=75°, ∠BCD=60°, AB=AD=10. What is the circumference of the quadrilateral ABCD?
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190124 还原机经选题: 文字题&几何
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The length of two adjacent sides of a quadrilateral is 30 and 40. Is the quadrilateral a rectangle?
1: The angle between the two sides is 90 °
2: The length of each diagonal of a quadrilateral is 50
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190124 还原机经选题: 文字题&几何
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Hexagon ABCDEF consists of rectangle BCEF, triangle ABF and triangle CDE. Triangle ABF and triangle CDE are congruent. AB = AF = 12, BC = 30. What is the possible length of AD?
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190124 还原机经选题: 文字题&几何
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ABCD is a square, and the length of side is 60. DE is a quarter arc with C as the center and CD as the radius. EF is a quarter arc with B as the center and BE as the radius. FG is a quarter arc with A as the center AF as the radius. GH is a quarter arc with D as the center DG as the radius. What is the total length of arcs DE + EF + FG + GH?
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190124 还原机经选题: 文字题&几何
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In the xy coordinate system, two lines,$$l_1$$ and $$l_2$$, are neither parallel to the x-axis nor to the y-axis. Do $$l_1$$ and $$l_2$$ intersect?
1: The slope of one line is twice that of the other
2: One line passes through (0,0) and the other passes through (2,0).
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190124 还原机经选题: 文字题&几何
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The equation of line l isy=ax+b . Does l go through the fourth quadrant?
1:a > 0
2:b < 0
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190321 还原机经选题: 文字题&几何
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The iron ball with radius r was recast into a cylinder with radius R and height H. H=12R. H/r=?
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