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GRE geometry

Terms

undefined, object
copy deck
3-4-5 triangle
figure out what the multiple of 3-4-5 is 
30-60-90 triangle
sides are in a 1:√3:2 ratio
45-45-90 triangle
sides are in a ration of: 1:1:√2
5-12-13 triangle
no need for the pathagrean theorem; use multiples of 5-12-13

distance between points:

P(x1, y1) and Q(x2, y2) 

use either:

  • pythagorean theorem or
  • special right triangles:
    • difference b/t the x's is one leg and the difference b/t teh y's is the other leg
  • Then use 3-4-5, 5-12-13, or pythagorean theorem
area of a circle
A=π(r*r)
area of a parallelogram
area of a prallelogram= bxh
area of a sector
area of a sector= (n/360)(πr*r)
area of a triangle
A=1/2(bxh)
bisector
divides angle into 2 equal angles
chord
line segment with endpoints on the circle
circumgerence
c=2πr
length of an arc
=(n/360)(2πr)
perimeter of a rectangle
P=2(L+W)
similar triangles

have the same shape: corresponding sides and angles are proportional

 

a/a=b/b 

slope
slope= Δy/Δx=rise/run
triangle inequality theorem

If you know the length of 2 sides of a triangle, then the 3rd side is:

  • greater than the positive difference
  • and less than the sum of the other 2 sides 
verticle angles

angles across the vertex from each other are equal.

adjacent angles add up to 180 

Volume of a rectangular solid
V=LxWxH

Deck Info

19

bpullar

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