geometry chap 11 & 12 formulas

triangle area

A = ½ bh

trapezoid area

A = ½ h (b₁ + b₂)

circle area

A = π r²

circle circumference

C = 2 π r

area of a sector

A = π r² * arc/360

kite/rhombus area

A =1/2 d₁ * d₂

regular polygons area

A ½ a P

regular polygons perimeter

value of one side * the number of sides

rectange SA

2 F/B

2 L/R

2 T/B

add all

rectangle volume

L * W * H

triangle SA

2 tri - LW/2 * 2

side

bottom

slant

add all

triangle V

Abase *depth

LW/2 *d

trapezoid SA

F/B ½ (h) (b₁ + b₂) * 2

bottom

top

2 sides

trapezoid V

Abase * depth

[1/2 h (b₁ + b₂)] * d

regular polygons V

½ h (all sides) * d

regular polygons SA

(1/2 (h) all sides) * 2

cylinder V

Abase * depth

π r² d

cylinder SA

2 π r² + 2 π r

cone V

π r² h

/3

cone SA

π r² + π r(slant)

sphere SA

4 π r²

sphere V

4 π r³

/3