几何
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If k is an integer and 2 < k < 7, for how many different values of k is there a triangle with sides of lengths 2,7, and k ?
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几何
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In the figure above, the area of square region PRTV is 81, and the ratio of the area of square region XSTU to the area of square region PQXW is 1 to 4. What is the length of segment RS?
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几何
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In the xy-plane, the point (-2, -3) is the center of a circle. The point (-2, 1) lies inside the circle and the point (4, -3) lies outside the circle. If the radius r of the circle is an integer, then r =
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几何
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In the figure shown, the circle has center O and radius 50, and point P has coordinates (50,0). If point Q (not shown) is on the circle, what is the length of line segment PQ ?(1) The x-coordinate of point Q is – 30.(2) The y-coordinate of point Q is – 40.
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