Question

Find the perimeter of each of the following shapes:



ii) An equilateral triangle of side 9 cm.​

Answer 1

Answer:

Side is 9 cm

perimeter of a triangle is sum of all side

So, 9+9+9

= 27 cm

Step-by-step explanation:

I hope it helps

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Answer 2

$\sf\Large{\underline{\underline{Answer:-}}}$

Given that,

• Find the perimeter of an equilateral triangle of side 9 cm.

⠀

We know that a triangle having all sides of equal length and angle is known as an equilateral triangle.

And it's given that the side of an equilateral triangle is 9cm, therefore it's other two sides will be 9cm each.

⠀

${\underline{\underline{\sf{\green{Hence,}}}}}$

Formula using here,

${\sf { \purple{ \boxed{ \sf Perimeter = 3 \times sides}}}}$

Putting the Values,

$\: \: \: \: \begin{gathered}\\\;\sf{:\rightarrow\;\;perimeter\;=\;\bf{3 \times 9}}\end{gathered}$

$\: \: \: \: \: \: \: \: \begin{gathered}\\\;\sf{:\rightarrow\;\;perimeter\;=\;\bf{27cm}}\end{gathered}$

$\sf\underbrace{Required \: Answer}$

The perimeter of the equilateral triangle is 27cm.

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$\color{pink}{\textbf{\textsf{Additional \: Information:-}}}$

TYPES OF TRIANGLES

Triangles can be classified according to the lengths of their sides and according to their interior angles.

⠀

■ Classification on the Basis of Sides

• A triangle in which all the three sides are equal, is called an equilateral triangle.
• A triangle in which any two of its sides are equal, is called an isosceles triangle.
• A triangle in which all three sides are of different lengths, is called a scalene triangle.

⠀

■ Classification on the basis of angles.

• A triangle in which all the angles are less than 90° (acute), is called an acute angled triangle.
• A triangle in which one angle is a right angle is called, a right angled triangle.
• A triangle in which one of the angle is more than 90° (obtuse), is called an obtuse angled triangle.