# Area and Perimeter

# Right-Angled Triangle

Calculate the area and perimeter of an right-angled triangle. This calculator uses feet and or inches for measurements.

Right-angled triangle = a triangle where one of the inside angles equals 90°

### Right Angled Triangle Area and Perimeter

#### Calculation

- length a in feet and or inches
- length b in feet and or inches
- decimal precision, the number of digits after the decimal point

#### Results

- the length of the diagonal in decimal feet
- the length of the diagonal in inches
- the length of the diagonal in feet and inches
- the area of the right-angled triangle in decimal square feet
- area in square feet and square inches
- the area in decimal square inches
- the area in square inches
- the area in square metres
- the perimeter of the right-angled triangle in decimal feet
- the perimeter in lineal feet and inches
- the perimeter in decimal inches
- the perimeter in inches
- the perimeter in metres

##### Formula

A = ab/2
P = a+b+√a²+b²
where A is the area of the ellipse
a the length of a side
b the length of the other side
P the perimeter of the triangle

##### Conversions

one square foot ( ft²) = 144 square inches (in²)
one square inch (in²) = 0.00694444444444443 square feet (ft²)
one square foot ( ft²) = 0.09290304 square metres (m²)
square inch (in²) = 0.00064516 square metres (m²)

### Area and Perimeter of Various Shapes

### Changing the shape of an Area

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