if perimeter of equilateral traingle is 90 m ,find its area?
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Answered by
11
We know that
Perimeter of equilateral triangle = 3a
90 cm = 3a
90 / 3 = a
a = 30 cm
Now,
We also know that
Area of equilateral triangle
Putting the value of a
We know that √3 = 1.732
So the area of equilateral triangle is 389.7 cm^2
Perimeter of equilateral triangle = 3a
90 cm = 3a
90 / 3 = a
a = 30 cm
Now,
We also know that
Area of equilateral triangle
Putting the value of a
We know that √3 = 1.732
So the area of equilateral triangle is 389.7 cm^2
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Answered by
4
Given ,
perimeter- 90 cm
Let x be the one side of a triangle
First ,
we find the one side of an equilateral triangle is
x+x+x = 90
=> 3x = 90
=> x = 90 ÷ 3
=> x = 30
Therefore , three sides are 30 [ equilateral triangle]
perimeter = 90 cm
Semiperemeter =
= 30 + 30 + 30 % 2 = 45 cm
Now ,
we find the area of the triangle
Area=
hiii here your answer hope I helped you please mark as branliest
perimeter- 90 cm
Let x be the one side of a triangle
First ,
we find the one side of an equilateral triangle is
x+x+x = 90
=> 3x = 90
=> x = 90 ÷ 3
=> x = 30
Therefore , three sides are 30 [ equilateral triangle]
perimeter = 90 cm
Semiperemeter =
= 30 + 30 + 30 % 2 = 45 cm
Now ,
we find the area of the triangle
Area=
hiii here your answer hope I helped you please mark as branliest
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