Question

100 area formulas of plane figures

Answer 1

FigureFormulaNomenclatureTriangleTriangle
Perimeter:Perimeter:

P=a+b+cP=a+b+c

Area:Area:

A=12bhA=12bha,b,c:sidesa,b,c:sides

b:baseb:base

h:heighth:heightSquareSquare
Perimeter:Perimeter:

P=4aP=4a

Area:Area:

A=a2A=a2a:sidea:sideRectangleRectangle
Perimeter:Perimeter:

P=2b+2hP=2b+2h

Area:Area:

A=bhA=bhb:baseb:base

h:heighth:heightCircleCircle
Perimeter:Perimeter:

P=2πrP=2πr

Area:Area:

A=πr2A=πr2r:radius