Geometry Flashcards
AREA of a CIRCLE
A=π(r^2)
CIRCUMFERENCE (perimeter) of a CIRCLE
C=2πr
LENGTH of a circle’s ARC
(______/360) x Circumference
VOLUME of a CUBE
V=a^3
SURFACE AREA of a CUBE
A=6(a^2)
Equilateral Triangle
All sides are equal
Isosceles Triangle
2 sides are the same
Congruent=
Identical
Scalene
All sides are different
HEIGHT for an EQUILATERAL Triangle
h=side x [square root (3)] / 2
AREA of a TRIANGLE
A=1/2bh
INSCRIBED Angle
Angle formed by 2 chords which have a common endpoint, called the vertex; The other 2 endpoints form the intercepted arc
Intercepted Arc Angle= 2 x Inscribed Angle
VOLUME of a CYLINDER
V= bh= π(r^2) x h
b= base = area of a circle h= height= height of a rectangle
AREA of a CYLINDER
A= 2πrh + 2π(r^2)
30, 60, 90 Triangle: Across from these angles equals what?
30= ? 60= ? 90= ?
30= X 60= X [square root (3)] 90= 2X
CENTRAL Angle
Any angle whose vertex is at the center of a circle
Minor Arc Angle= Central Angle
AREA of a SQUARE
A= a^2
AREA of a RECTANGLE
A= ab
AREA of a PARALLELOGRAM
A= bh
AREA of a TRAPEZOID
A= (h/2) x (b1 + b2)
AREA of an EQUILATERAL Triangle
A= (1/4) x [square root (3)] x (a^2)
AREA of a TRIANGLE given SAS
A= (1/2) a b Sin(C)
VOLUME of a RECTANGULAR Prism
V= abc
VOLUME of a PYRAMID
V= (1/3)bh
VOLUME of a CONE
V=(1/3)bh= (1/3) π (r^2) h
VOLUME of a SPHERE
V= (4/3) π (r^3)
Surface AREA of a SPHERE
A= 4 π (r^2)
45, 45, 90 Triangle: Across from these angles equals what?
45= ? 45= ? 90= ?
45= X 45= X 90= (X) x [square root (2)]
