Question

find the third side of the trinagle if the perimeter of that tringle is 20 and two of its side are 5m and 4 m​

Answer 1

Answer:

Answer is in the pic....mate..

Answer 2

Given -

• Perimeter of triangle = 20 m
• Sides of triangle -
• 5 m
• 4 m

To find -

• Third side of triangle

Solution -

Let the third side of triangle = x

As we know,

$\overbrace{\underbrace{ \large \sf \red{perimeter = sum \: of \: all \: the \: sides}}}$

Put the given values -

↬ x + 5 + 4 = 20

↬ x + 9 = 20

↬ x = 20 - 9

↬ x = 11

The value of x = 11

Third angle = x = 11 m

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Know more -

There three types of triangle -

• Equilateral triangle
• Isosceles triangle
• 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