Study guides

☆☆

Q: How do you find the perimeter of a triangle if you know the area?

Write your answer...

Submit

Still have questions?

Continue Learning about Math & Arithmetic

The base is one third of the perimeter, half of the base times the height is the area.

If you know the lengths of 2 sides and the included angle then use: Area of a triangle = 1/2*a*b*sinC

To find the perimeter of a triangle you have to add up all the sides. So to find the perimeter of this triangle you just add 2x+5x+6x=13x. To find the actual perimeter you would have to know what x equals

I need to know more about the triangle, such as one or 2 of the angles, whether it is isosceles or equilateral, or whether the lengths share a certain ratio. For example, a triangle of sides 8,8 and 5 (perimeter of 21) will surely have a different area as compared to a triangle of sides 7,7 and 7 (perimeter of 21 as well)

Divide the perimeter by 3 to find the length of each of its 3 equal sides Area = 0.5*side squared*sin(60 degrees) Alternatively use Pythagoras' theorem to find its height then area is: 0.5*base*height

Related questions

The base is one third of the perimeter, half of the base times the height is the area.

If you know the perimeter, there is no need to find it again.

Only if you also know the shape and proportions. An equilateral triangle, for example.

No.

The answer depends on what is special about the triangle and what else you know about it.

If you know the lengths of 2 sides and the included angle then use: Area of a triangle = 1/2*a*b*sinC

To find the perimeter of a triangle you have to add up all the sides. So to find the perimeter of this triangle you just add 2x+5x+6x=13x. To find the actual perimeter you would have to know what x equals

I need to know more about the triangle, such as one or 2 of the angles, whether it is isosceles or equilateral, or whether the lengths share a certain ratio. For example, a triangle of sides 8,8 and 5 (perimeter of 21) will surely have a different area as compared to a triangle of sides 7,7 and 7 (perimeter of 21 as well)

To get the perimeter, you need to add all three sides. I assume you can get the third side by inserting the numbers you know into Heron's formula.

It is impossible

Divide the perimeter by 3 to find the length of each of its 3 equal sides Area = 0.5*side squared*sin(60 degrees) Alternatively use Pythagoras' theorem to find its height then area is: 0.5*base*height

Not exactly. If I know the side lengths, I can still find the perimeter

People also asked