A **right triangle** or **right-angled triangle** is a triangle in which one angle is a right angle. The side opposite the right angle is called the hypotenuse
(side *c*). The sides adjacent to the right angle are called legs. Side **a** may be identified as the side adjacent to angle *B* and opposed to angle *A*, while
side *b* is the side adjacent to angle A and opposed to angle B.

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The perimeter of a shape is out side distance of that shape. To find the perimeter of a shape, take the sum of the length of each side. In right triangle, the perimeter can be calculated by adding the three side length of triangle.

**Formula to find perimeter:**

Perimeter of the triangle = sum of three side length of triangle.

P= a + b + c.

1. The three sides of right triangles are 12cm, 5cm and 13 cm. find the perimeter of the triangle.

**Solution:**

Given:

Three side length 12cm, 5cm and 13 cm.

**Formula:**

**Perimeter of the right triangle (p) =a + b + c**

=12 + 5 + 13

=30

**Perimeter of the right triangle (p) =30 cm**

2. The three sides of right triangles are 12m, 10m and 6.6 m. find the perimeter of the triangle.

**Solution:**

Given:

Three side length 12cm, 10cm and 6.6 cm.

**Formula:**

**Perimeter of the right triangle (p) =a + b + c**

=12 + 10+ 6.6

=28.6

**Perimeter of the right triangle (p) =28.6cm**

3. The three sides of right triangles are 5.8cm; 5cm and 3 cm. find the perimeter of the triangle.

**Solution:**

Given:

Three side length 5.8cm, 5cm and 3 cm.

**Formula:**

**Perimeter of the right triangle (p) =a + b + c**

=5.8 + 5 + 3

=13.8cm

**Perimeter of the right triangle (p) =13.8cm**

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**Practice problem in right triangle:**

1. Find the perimeter of the triangle, its sides length are 11.66 m, 6m and 10m.

** Answer: Perimeter: 27.66m**

2. Three sides of right triangles are 12 feet, 14 feet and 18.4 feet. Find perimeter of triangle.

** Answer: Perimeter: 44.4 feet**