Question

5. Sudipta makes a wall hanging. Using triangles, she cuts 3 equilateral
triangles and decorates them. If the sides of the triangles are 5 cm, 6 cm,
and 9 cm, respectively, find the perimeter of each triangle.​

Answer 1

Given:

Sudipta makes a wall hanging.

Using triangles, she cuts 3 equilateral triangles and decorates them.

If the sides of the triangles are 5 cm, 6 cm, and 9 cm, respectively

To find:

The perimeter of each triangle

Solution:

We know,

$\boxed{\bold{Equilateral \:Triangle }}:-$ A triangle whose all the 3 sides are equal in length is known as an equilateral triangle.

$\boxed{\bold{Perimeter\:of\:a \:triangle = sum \:of \:all\: 3 \:sides}}$

Finding the perimeter of the equilateral triangle with sides 5 cm:

Length of each side = 5 cm

∴ Perimeter = 3 × side = 3 × 5 = 15 cm

Thus, the perimeter of the equilateral triangle with each side as 5 cm is → 15 cm.

Finding the perimeter of the equilateral triangle with sides 6 cm:

Length of each side = 6 cm

∴ Perimeter = 3 × side = 3 × 6 = 18 cm

Thus, the perimeter of the equilateral triangle with each side as 6 cm is → 18 cm.

Finding the perimeter of the equilateral triangle with sides 9 cm:

Length of each side = 9 cm

∴ Perimeter = 3 × side = 3 × 9 = 27 cm

Thus, the perimeter of the equilateral triangle with each side as 9 cm is → 27 cm.

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