Area and Perimeter > Right-angled Triangle

# Area and Perimeter: Right-angled Triangle

This online calculator is a free online tool to help you in calculate area and perimeter of Right-angled Triangle.

## Formula

- P – perimeter
- A – area

- a,b – right-angled legs
- c – hypotenuse

You may need: Area and Perimeter of Triangle

## Right-angled Triangle

A right-angled Triangle is a triangle that has one angle that measures 90°. The side that opposite from the 90° angle is the longest side of the triangle, we call this hypotenuse and usually referred with variable c. The other side of the right-angled Triangle commonly referred with variable a and b. The sum of angles in the Right-angled Triangle is 180°.

## The standard formula to count the Area of Right-angled Triangle

A= ab/2

A = area

a = side of the triangle

b = shortest side of the triangle

## The standard formula to count the Perimeter of Right-angled Triangle

P= a+b+c

P = perimeter

a = side of the triangle

b = shortest side of the triangle

c = hypotenuse of the triangle

## The Instruction to use the Calculator Online to calculate the Area and Perimeter of Right-angled Triangle

1. First, input 2 values between edges(a, b) or edges (c) with alpha / beta angle in the right-angled triangle

2. Next, you can choose what decimal places you need. It can 1 or 2 or whatever you want.

3. And then, click “Calculate Button” and the answer (Perimeter and Area) will automatically appear.

4. To count another number, just repeat the first step.

## Example of the usage of calculator online to count the Area and Perimeter of Right-angled Triangle

1. Example, enter “3” in “a”, and “4” in “b” of the right-angled triangle.

2. Then click enter or “Calculate” button.

3. You will find the answer right there on the Area A column and Perimeter P column. The area is **6.00** and the Perimeter is **12.00**.