To prove that the diagonals of a rhombus are

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38. To prove that the diagonals of a rhombus are perpendicular to each other, you would position and label a rhombus on a coordinate plane and then find which of the following? 39. Name a diameter. 40. Name a chord. Page 4/12
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41. Name a secant. 42. If the diameter of a circle is 10 inches, find the circumference to the nearest hundredth. 43. If m BAD 110 º in circle A, find m DE. 44. Points X and Y lie on circle P so that PX = 5 meters and m XPY = 90 º . Find the length of XY to the nearest hundredth. 45. Chords XY and WV are equidistant from the center of circle O. If XY = 2x + 30 and WV= 5x - 12, find x. 46. Find the radius of circle O if DE = 12 inches and DE is the perpendicular bisector of OF . 47. Find x. 48. EFGH is a quadrilateral inscribed in circle P with m E = 72 º and m F = 49 º . Find m H. 49. If AB is tangent to circle C at A, find BC. 50. , , , PQ QR RS and SP are tangent to circle X. Find RS. 51. Circle A has its center at A(3, 2), and uur s CB is tangent at (6, 4). Find the slope of uur s CB . Page 5/12
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52. Find x. 53. Find y. 54. Find z. 55. Find x. 56. Find the center of the circle whose equation is (x + 11) 2 + (y – 7) 2 = 121.
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