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
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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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
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 Cm
According to question,
Sum of all sides
3rd side
So,3rd side
Required length of 3rd side is 30 cm.