Area Basic Formulae SACHS

Rectangles

 $A=lb$ 
means:

• Area = length x base

• Area = 16

• Area = length x breadth

• Area = length + breadth

Parallelograms

 $A=bh$  
means:

• Area = base x height

• Area = base + height

• Area = both heights

• Area = base halved

Triangles:

 $A=\frac{1}{2}bh$  
means

• Area =  $\frac{1}{2}$  the base

• Area =  $\frac{1}{2}$  + base + height

• Area =  $\frac{1}{2}$  x base x height

• Area =  $\frac{1}{2}$  6h

Rhombus/Kites:

 $A=\frac{1}{2}xy$  
means

• Area =  $\frac{1}{2}$  x side x side

• Area =  $\frac{1}{2}$  x diagonal 1 x diagonal 2

• Area =  $\frac{1}{2}$  x length x breadth

• Area =  $\frac{1}{2}$  x base x height

Trapeziums:

 $A=\frac{1}{2}h\left(a+b\right)$  
means

• Area =  $\frac{1}{2}$  x height x (sum of parallel sides)

• Area =  $\frac{1}{2}$  x height x c

• Area =  $\frac{1}{2}$  x height x ab

• Area =  $\frac{1}{2}$  x height x (sum of slanted sides)

Area =

• Area = 4 + 9

• Area = 4 + 9 + 4 + 9

• Area = 4 x 9

• Area = 4⁹

• Area = $\frac{1}{2}$ x 7 x 4

• Area = $\frac{1}{2}$ x 7 x 5

• Area = 7 x 4

• Area = 7 x 5

• Area = $\frac{1}{2}$ x 3 x 9

• Area = $\frac{1}{2}$ x 6 x 13

• Area = $\frac{1}{2}$ x 3 x 4

• Area = $\frac{1}{2}$ x 6 x 9