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33 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Vertex
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จุดยอด
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Altitude
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the perpendicular from the base to the opposite vertex.
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Median
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line from midpoint of base to vertex. 3 medians per triangle. All medians intersect at Centriod.
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Two-third of the length of each median
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between vertex and centroid
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One-third of the length of each median
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between centroid and base
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Another area formula
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A=√s(s-a)(s-b)(s-c)
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; s= (a+b+c)/2 , a b c = each side of triangle
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Triangle side
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a+b>c , a-b
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mid segment of a triangle
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a line segment joining the midpoints of two sides of a triangle. Half length of another side.
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Congruence Angle
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Only SAS, SSS, ASA [NOT AAA (only similarity) or SSA]
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Scalene triangle
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all sides and angles are different from one another
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equilateral triangle
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A=a^2 x √3/4
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Right triangle
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3,4,5
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5,12,13
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Right triangle 60 30
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1 √3 2
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Right triangle 45-45
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1 1 √2
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hypotenuse
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ด้านตรงข้ามมุมฉาก
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Right triangle in circle
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hypotenuse = diameter only
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circle inscribed in right triangle
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r= ab/(a+b+c)
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sum of interior triangle
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180(n-2) ; n=number of sides
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diagonal
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เส้นแทยงมุม
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another area formula for square
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half of product of diagonal = d^2 / 2
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circumference
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เส้นรอบวง
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inscribed angle of circle
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is always half of the measure of the central
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inscribed angle of circle
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only depend on point a,c (two leg)
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distant between two point
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√(x1-x2)^2 + (y1-y2)^2
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distant between two paralell line
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y= mx+b , y=mx+c : D= |b-c|/(√m^2+1) เอาจุดตัดแกน y มาลบกัน หารด้วย รูทสโลปกำลังสอง+1
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Perpendicular slope
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-1/m
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Check perpendicular
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slope A x Slope B = -1
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distant from point to line
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|ax+by+c|/√a^2+b^2 : ax+by+c=0 is linear equation, (x,y) is the point
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circle on a plane
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(x-a)^2 + (y-b)^2 = r^2 ; (a,b) = center origin a=b=0
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distant between p and m on the number line is the same as the distance between p and
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|p-m|=|p-n|
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parabola
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ax^2+bx+c
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vertex of parabola
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(-b/2a, c-b^2/4a)
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Front (Term) |
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