###
sum of angles in a polygon

(n-2)(180)

###
the length of each side of a triangle must be

less than the sum of the length of the other two sides

###
equilateral triangle

triangle with three congruent sides, three equal angles, each is 60 degrees

###
isosceles triangle

triangle with at least two congruent sides, two angles opposite the equal sides are also equal

###
isosceles right triangle

triangle with two equal sides, two equal angles, and one 90° angle; sides are always in the ratio 1:1:root2.

###
30-60-90 right triangle

Triangle with the side ration of Short Leg: Long Leg: Hypotenuse:: x : x(root-3) : 2x

###
area of a triangle

A = (1/2)b*h

###
congruent triangle criteria

three sides equal, two sides and one included angle equal, or two angles and one included side equal

###
congruent triangles

triangles with same shape and size

###
similar triangles

triangles with same shape but not necessarily size

###
scalene triangle

a triangle with no two sides of equal length

###
angles between these of a kite are equal

the two sets of non-equal sides

###
ubiquitous

present or existing everywhere

###
garrulous

given to much talking, tediously chatty

###
solicitous

showing hovering attentiveness

###
laconic

using very few words

###
fastidious

1. very attentive to detail and accuracy

2. very attentive to cleanliness

###
taciturn

reserved or uncommunicative in speech; saying little

###
prevarication

lie: a statement that deviates from or perverts the truth

###
avarice

extreme greed for material wealth or gain

###
baseness

unworthiness by virtue of lacking higher values

###
debased

ruined in character or quality

###
jettison

to cast overboard, get rid of as unnecessary or burdensome

###
distill

to separate or extract the essential elements of

###
modish

in the current fashion or style

###
sanguine

reddish color; cheerfully optimistic

###
salubrious

1. health-giving, healthy

2. pleasant

###
remedial

1. giving or intended as a remedy or cure

2. intended for students experiencing learning difficulties

###
injudicious

showing poor judgement, unwise

###
calumnious

slanderous or defamatory

###
inveigle

persuade someone to do something by flattery or deception

###
timorous

suffering from nervousness or lack of confidence

###
diffident

lacking self-confidence

###
intractable

hard to control or deal with

###
evanescent

quickly fading or disappearing

###
recrudescent

revival of an unfortunate situation after period of abatement

###
inimical

1. tending to obstruct or harm

2. unfriendly, hostile

###
sides of a 45-45-90 triangle

1 : 1 : √2

###
sides of a 30-60-90 triangle

1 : √3 : 2

###
Special side-based right triangles

3:4:5, 5:12:13

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