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Cards In This Set
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Radius
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Center point of a circle to the end; half of the diameter
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Diameter
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Line through the center of the circle
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Common right triangles
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3-4-5, 6-8-10, 9-12-15, 12-16-20, 15-20-25
5-12-13, 10-24-26
8-15-17
7-24-25
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Pythagorean theorem
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If it is a right triangle, then a2 + b2 = c2
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Converse of pythagorean theorem
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If a2 + b2 = c2 , then it is a right triagle
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45-45-90 special rules
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s is the short leg. s square root of 3 is the other leg. hypotenuse is 2s
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30-60-90
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Short side is s, long side is s square root of 3: hypotenuse is 2s
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45-45-90
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Legs are both s
hypotenuse is s square root of 2
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Distance formula between points A and B
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distance2 = (xx - x2)2 + (y2 - y2)2 or
distance = (xx - x1) + (y2 - y1)
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Equation of a circle with center (h, k) and radius r
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(x - h)2 + (y - k)2 = r2
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Tangent conjecture
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A tangent to a circle is perpendicular to the radius drawn to the point of tangency.
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Angles inscribed in a semicircle conjecture
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Angles inscribed in a semicircle are right angles
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