when there’s 2 chords?

piece • piece = piece • piece

how to find sector area?

x°/360° • pi • r(squared)

when vertex is outside?

angle= 1/2([big] arc - [small] arc

when there’s a secant and tangent?

whole • whole = whole • outside

when there’s 2 secants? (may not be congruent)

whole • outside = whole • outside

how to find inscribed angle?

inscribed angle • 2 = arc angle

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Formulas for 3rd tri geometry final

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Questions 24

Answers

1
LA of a cone?
pi • r • l
(5s)l/2
tangent = tangent
lwh
2
when there’s 2 chords?
piece • piece = piece • piece
whole • outside = whole • outside
tangent = tangent
d1 • d2 /2
3
what’s the area of a regular polygon?
pi • d
d1 • d2 /2
pi • r(squared)
aP/2
4
volume for ALL pyramids?
(aP)/2
lwh
4pi • r(cubed)/3
bh/3
5
volume of a cylinder?
pi • r(squared)h
lwh/3
bh/3
(aP)/2
6
when there’s 2 tangents?
whole • whole = whole • outside
angle= 1/2([big] arc - [small] arc
whole • outside = whole • outside
tangent = tangent
7
finding degree?
central angle / 2
pi • r(squared)
pi/180
180/pi
8
how to find arc length?
x°/360° • pi • r(squared)
there’s no inscribed angle
x°/360° • pi•d
whole • outside = whole • outside
9
how to find sector area?
d1 • d2 /2
x°/360° • pi•d
pi/ 180
x°/360° • pi • r(squared)
10
volume of a hemisphere? (bowl only)
2pi • r(cubed)/3
(aP)/2
4pi • r(cubed)/3
x°/360° • pi • r(squared)
11
LA of cylinder?
pi • r • l
(5s)l/2
pi • r
pi • d • h
12
when vertex is inside (NOT at the center)?
angle= 1/2 arc
tangent = tangent
angle= 1/2([big] arc - [small] arc)
angle= 1/2(arc + arc)
13
SA formula?
(4s)h
2B + Ph
LA
B
14
SA of a sphere?
pi/180
4 • pi • r(squared)
x°/360° • pi • r(squared)
2B + Ph
15
SA of a hemisphere?
2 • pi • r(squared)
lwh
d1 • d2 /2
central angle / 2
16
when vertex is outside?
angle = arc
angle= 1/2([big] arc - [small] arc
angle= 1/2 arc
tangent = tangent
17
when there’s a secant and tangent?
whole • outside = whole • outside
tangent = tangent
bh
whole • whole = whole • outside
18
What’s the area of a trapezoid?
(b1 + b2)h /2
pi • r(squared)
bh
d1 • d2 /2
19
finding radian?
180/pi
tangent = tangent
pi/180
x°/360° • pi • r(squared)
20
volume of a sphere?
tangent = tangent
bh
pi • r(squared)h/3
4pi • r(cubed)/3
21
how to find central angle?
central angle ≠ arc angle
central angle / 2
central angle • 2 = arc angle
central angle = arc angle
22
what’s the area of a kite and rhombus?
pi • d
d1 • d2 /2
l•w
pi • r(squared)
23
when there’s 2 secants? (may not be congruent)
whole • whole = whole • outside
pi • r(squared)
whole • outside = whole • outside
tangent = tangent
24
how to find inscribed angle?
inscribed angle • 2 = arc angle
pi • r(squared)
there’s no inscribed angle
central angle ≠ arc angle

Formulas for 3rd tri geometry final Flashcards | StudBud