Geometry Area Formulas

Front 1

A=BH
area =base x height

Back 1

parallelogram

Front 2

A=S squared

area= side squared

Back 2

square

Front 3

A=1/2 BH

area = 1/2 base x height

Back 3

triangle (regular)

Front 4

side squared times the square root of 3 over 4.

sorry i couldn't make the formula with my computer :)

Back 4

triangle (equilateral)

Front 5

the square root of S (S-A) (S-B) (S-C)

the S stands for the semi perimeter which is the perimeter of the triangle divided by 2. The A,B,and C represent the lengths of the individual sides of the triangle.

Back 5

triangle (all sides given)

Front 6

1/2 D1 D2

1/2 of diagonal 1 x diagonal 2

Back 6

rhombus

Front 7

1/2 H(B1+B2)

1/2 of Height x base 1 + base 2

Back 7

trapezoid

Front 8

1/2 D1 D2

1/2 of diagonal 1 x diagonal 2

Back 8

Kite

Front 9

pie x radius squared

Back 9

circle

Front 10

degrees x (pie x radius squared)
-------------
360

Back 10

sector

Front 11

1/2 AP

1/2 of Apothem x perimeter

Back 11

Polygon

Front 12

pie x diameter

Back 12

Circumference

Front 13

degrees x (pie x diameter)
------------
360

Back 13

Arc Length

Front 14

the sector - the area of the triangle

if you saw one of these problems you would know what i am talking about.

Back 14

Segment of a circle