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32 terms

Geometry Test 1

STUDY
PLAY
30-60-90 Special Right Triangle
a, 2a, a√3
45-45-90 Special Right Triangle
a, a, a√2
Polygon
closed, 2D figure whose sides are segments (straight) and intersect only at their end points (vertex; vertices)
Trapezoid
a quadrilateral with exactly one set of parallel sides
Parallelogram
a quadrilateral with exactly two sets of parallel sides
Rhombus
a parallelogram with four congruent sides (not necessarily 90° angles)
Square
a quadrilateral with two sets of equal sides and four 90° angles
Rectangle
a quadrilateral with two sets of equal sides and four 90° angles
5 sided polygon
pentagon
6 sided polygon
hexagon
7 sided polygon
heptagon
8 sided polygon
octagon
9 sided polygon
nonagon
N-sided polygon
n-gon
Area
measurement of space inside a figure
Area of a Parallelogram
Area=base x height
Area of a Trapezoid
(only 1 set of parallel lines) A=(b1+b2/2)h
Circumference (definition)
measurement around circle
Circumference (formula)
circumference=diameter x ∏ (pi)
Area of a circle
A=∏(r2)
Prism
has 2 congruent bases that are parallel (can be any polygon) All remaining faces (sides) are rectangles
Cylinder
a solid with 2 congruent circular bases that are parallel to each other
Surface area (S.A.)
the sum of the areas of the faces of a solid
Area of a triangle
A=1/2 bh
Pythagorean Theorem
a2+b2=c2
Equilateral
congruent sides and angles
Isosceles Triangle
has 2 congruent sides
Scalene Triangle
has NO congruent sides
Acute
<90°
Right Angle
exactly 90°
Obtuse
>90°
Perimeter
the sum of the measurements of each face of a polygone