User Manual

48 — Construction Master IV
APPENDIX B
Area Formulas
w
l
Rectangle
A
rea = lw
b
a
Triangle
A
rea = ab
1
2
Square
A
rea = a
a
a
2
r
Circle
Circumference = 2
π
r
A
rea =
π
r
2
b
a
Ellipse
A
rea =
π
ab