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2D GEOMETRY FORMULAS
SQUARE
s = side
Area: A = s2
Perimeter: P = 4s
s
s
RECTANGLE
l = length, w = width
Area: A = lw
Perimeter: P = 2l + 2w
w
l
TRIANGLE
b = base, h = height
Area: A = 1
2 bh
Perimeter: P = a + b + c
h
b
a c
EQUILATERAL TRIANGLE
s = side
Height: h =
√
3
2 s
Area: A =
√
3
4 s2
h
s
s s
PARALLELOGRAM
b = base, h = height, a = side
Area: A = bh
Perimeter: P = 2a + 2b
b
h a
TRAPEZOID
a, b = bases; h = height;
c, d = sides
Area: A = 1
2 (a + b)h
Perimeter:
P = a + b + c + d b
h
a
c d
CIRCLE
r = radius, d = diameter
Diameter: d = 2r
Area: A = πr2
Circumference: C = 2πr = πd r
d
SECTOR OF CIRCLE
r = radius, θ = angle in radians
Area: A = 1
2 θr2
Arc Length: s = θr
r
s
θ
ELLIPSE
a = semimajor axis
b = semiminor axis
Area: A = πab
a
b
Circumference:
C ≈ π
?
3(a + b) −
?
(a + 3b)(b + 3a)
?
ANNULUS
r = inner radius,
R = outer radius
Average Radius: ρ = 1
2 (r + R)
Width: w = R − r
Area: A = π(R2 − r2)
or A = 2πρw
r
R
REGULAR POLYGON
s = side length,
n = number of sides
Circumradius: R = 1
2 s csc(π
n )
Area: A = 1
4 ns2 cot(π
n )
or A = 1
2 nR2 sin(2π
n )
R
s
http://pdf-ebooks-for-free.blogspot.in/
3D GEOMETRY FORMULAS
CUBE
s = side
Volume: V = s3
Surface Area: S = 6s2
s
s
s
RECTANGULAR SOLID
l = length, w = width,
h = height
Volume: V = lwh
Surface Area:
S = 2lw + 2lh + 2wh
l
w
h
SPHERE
r = radius
Volume: V = 4
3 πr3
Surface Area: S = 4πr2
r
RIGHT CIRCULAR
CYLINDER
r = radius, h = height
Volume: V = πr2h
Surface Area: S = 2πrh + 2πr2
r
h
TORUS
r = tube radius,
R = torus radius
Volume: V = 2π2r2R
Surface Area: S = 4π2rR
R r
GENERAL CONE
OR PYRAMID
A = area of base, h = height
Volume: V = 1
3 Ah
h
A
RIGHT CIRCULAR CONE
r = radius, h = height
Volume: V = 1
3 πr2h
Surface Area:
S = πr
√
r2 + h2 + πr2
h
r
FRUSTUM OF A CONE
r = top radius, R = base radius,
h = height, s = slant height
Volume: V = π
3 (r2 + rR + R2)h
Surface Area:
S = πs(R + r) + πr2 + πR2
s
h R
r
SQUARE PYRAMID
s = side, h = height
Volume: V = 1
3 s2h
Surface Area:
S = s(s +
√
s2 + 4h2)
h
s
s
REGULAR TETRAHEDRON
s = side
Volume: V = 1
12
√
2s3
Surface Area: S =
√
3s2
s
http://pdf-ebooks-for-free.blogspot.in/

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2D and 3D Geometry Formulas eBook

  • 1. 2D GEOMETRY FORMULAS SQUARE s = side Area: A = s2 Perimeter: P = 4s s s RECTANGLE l = length, w = width Area: A = lw Perimeter: P = 2l + 2w w l TRIANGLE b = base, h = height Area: A = 1 2 bh Perimeter: P = a + b + c h b a c EQUILATERAL TRIANGLE s = side Height: h = √ 3 2 s Area: A = √ 3 4 s2 h s s s PARALLELOGRAM b = base, h = height, a = side Area: A = bh Perimeter: P = 2a + 2b b h a TRAPEZOID a, b = bases; h = height; c, d = sides Area: A = 1 2 (a + b)h Perimeter: P = a + b + c + d b h a c d CIRCLE r = radius, d = diameter Diameter: d = 2r Area: A = πr2 Circumference: C = 2πr = πd r d SECTOR OF CIRCLE r = radius, θ = angle in radians Area: A = 1 2 θr2 Arc Length: s = θr r s θ ELLIPSE a = semimajor axis b = semiminor axis Area: A = πab a b Circumference: C ≈ π ? 3(a + b) − ? (a + 3b)(b + 3a) ? ANNULUS r = inner radius, R = outer radius Average Radius: ρ = 1 2 (r + R) Width: w = R − r Area: A = π(R2 − r2) or A = 2πρw r R REGULAR POLYGON s = side length, n = number of sides Circumradius: R = 1 2 s csc(π n ) Area: A = 1 4 ns2 cot(π n ) or A = 1 2 nR2 sin(2π n ) R s http://pdf-ebooks-for-free.blogspot.in/
  • 2. 3D GEOMETRY FORMULAS CUBE s = side Volume: V = s3 Surface Area: S = 6s2 s s s RECTANGULAR SOLID l = length, w = width, h = height Volume: V = lwh Surface Area: S = 2lw + 2lh + 2wh l w h SPHERE r = radius Volume: V = 4 3 πr3 Surface Area: S = 4πr2 r RIGHT CIRCULAR CYLINDER r = radius, h = height Volume: V = πr2h Surface Area: S = 2πrh + 2πr2 r h TORUS r = tube radius, R = torus radius Volume: V = 2π2r2R Surface Area: S = 4π2rR R r GENERAL CONE OR PYRAMID A = area of base, h = height Volume: V = 1 3 Ah h A RIGHT CIRCULAR CONE r = radius, h = height Volume: V = 1 3 πr2h Surface Area: S = πr √ r2 + h2 + πr2 h r FRUSTUM OF A CONE r = top radius, R = base radius, h = height, s = slant height Volume: V = π 3 (r2 + rR + R2)h Surface Area: S = πs(R + r) + πr2 + πR2 s h R r SQUARE PYRAMID s = side, h = height Volume: V = 1 3 s2h Surface Area: S = s(s + √ s2 + 4h2) h s s REGULAR TETRAHEDRON s = side Volume: V = 1 12 √ 2s3 Surface Area: S = √ 3s2 s http://pdf-ebooks-for-free.blogspot.in/