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23 Cards in this Set
- Front
- Back
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circle
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the set of all points in a plane that are a given distance from a given point
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center
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the given point
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radius
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(the given distance) a line segment with one endpoint on the circle and the other endpoint the center of the circle
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chord
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a line segment whose endpoints are on the circle
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diameter
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a chord that passes through the center of the circle
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Diameter equation
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d=2r (diameter = twice the radius)
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circumference
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the distance around a circle
*C=2πr *C=*pi*d pi=22/7 pi=3.14 |
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area
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the amount of space (square units) inside a closed figure.
A=*pi*r*squared* |
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arc
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part of a circle
symbol: (an arc) Name an arc using either 2 or 3 letters with endpoints on either side. |
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semicircle
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an arc whose endpoints are the endpoints of a diameter
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major arc
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an arc that is greater than a semicircle
(use 3 letters to name one) |
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minor arc
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an arc that is less than a semicircle
(2 or 3 letters) |
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central angle
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an angle whose vertex is the center of the circle and whose sides are radii of the circle
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inscribed angle
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an angle whose vertex is on the circle and whose sides are chords of the circle.
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intercepted arc
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an arc that is "cut off" by the angle.
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********
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1.The measure of a central angle is equal to the measure of its intercepted arc.
2. The measure of an inscribed angle is half the measure of its intercepted arc. |
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square (area + perimeter)
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Area = s squared
Perimeter = 4s |
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rectangle (area + perimeter)
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A = lw
P = 2l+2w |
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Parallelogram (area + perimeter)
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A=bh
P=sum of the lengths of the sides |
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Triangle (area + perimeter)
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A=1/2bh
*Every triangle has 3 heights. P=sum of the lengths of the sides. |
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altitude(of a triangle)
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the line segment with one endpoint, a vertex, and it is perpendicular to the line containing the opposite side.
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height of a triangle
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the length of the altitude
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trapezoid (area + perimeter)
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A=1/2h(base 1+ base 2)
P= sum of the lengths of the sides |
