Question

Triangles with lengths of sides 7 cm , 11 cm , 13 cm will be called a_______?________ triangles

Answer 1

$\huge\sf{\underline{\sf{\red{Required~Answer}}}}$

• Triangles with lengths of sides 7 cm , 11 cm , 13 cm will be called a scalene triangles.

Reason - All the sides are unequal and when the measure of all the three sides is different it is known as a scalene triangle.

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$\huge\bold{Know~more}$

There three types of triangle -

1. Equilateral triangle
2. Isosceles triangle
3. Scalene triangle 

Equilateral triangle -

• In this all three sides are equal.

• Area of equilateral triangle -

↬ $\sf{\dfrac{\sqrt{3}}{4}a^2}$

• Perimeter of equilateral triangle -

↬ 3a

where,

a = side of triangle

Isosceles  triangle -

• In this two sides of triangle are equal.

• Area of isosceles triangle -

↬ $\sf{\dfrac{1}{2} \times base \times height}$

• Perimeter of isosceles triangle -

↬ 2a + b

Scalene triangle -

• In this no side is equal.

• Area of scalene triangle -

↬ Heron's formula = $\sf{\sqrt{s(s - a)(s - b)(s - c)}}$

• Perimeter of scalene triangle -

↬ Perimeter = Sum of all three sides