Math, asked by 4345sampaths, 9 months ago

If perimeter of a triangle is 100cm and the length of two sides are 30cm and 40cm, the length of third side will be:

(a)30cm

(b)40cm

(c)50cm

(d)60cm

Answers

Answered by divyankmaan
26

Answer:

a) 30cm

Step-by-step explanation:

Let the length of the third side be x.

Perimeter = Sum of the length of all sides = 100cm

30 + 40 + x = 100

x = 100-70

Thus, x = 30cm

Hence, the length of the third side is 30cm.

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Answered by payalchatterje
4

Answer:

Required length of 3rd side is 30 cm.

So,option a is the correct answer.

Step-by-step explanation:

Given,

Perimeter of the triangle is 100 cm.

And length of one side is 30 cm and length of another side is 40 cm.

We know perimeters of triangle  =  \: sum \: of \: all \: sides

By this formula we can easily found perimeter of any 2D figure because sum of all sides is formula of perimeter of all 2D figure like rectangle, square, parallelograms ,triangle etc.

For example,

Let a equilateral triangle has side of x cm.

Then perimeter of the triangle is x + x + x = 3xCm

According to question,

Sum of all sides = 100

30 + 40 +

3rd side = 100

So,3rd side = 100 - 70 = 30

Required length of 3rd side is 30 cm.

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