Landscape Fabric for Five Sided Land

The Landscaping Fabric for a 5 Sided Area calculator computes an area with five straight sides (a pentagon) given the length of the five sides and two diagonals (see image).

INSTRUCTIONS:  Choose units and enter the following:

• (A) Length of side A
• (B) Length of side B
• (C) Length of side C
• (D) Length of side D
• (E) Length of side E
• (F) Length of Diagonal F
• (G) Length of Diagonal G  
• (FRW) Fabric Roll Width
• (FRL) Fabric Roll Length

Landscape Fabric Needed for a Five Sided Area(LSF): The calculator returns the number of standard rolls of landscape fabric and the area of the garden in square feet.  However, these can be automatically converted to compatible units via the pull-down menu.

The Math / Science

To compute the area of a polygon, one must reduce the measurements down to non-overlapping triangles.  This is why the diagonals are needed. 

WHAT DIAGONALS TO CHOOSE

Since we are defining triangles, it's important to get the order correct.  Pick any corner, and consider that corner as where side A begins, and as the point to measure your two diagonals.  

• Step 1 - Pick any corner, and measure sides A, B, C, D and E.
• Step 2 - From the point where Side E ends and Side A starts, measure the diagonal from (E,A) to (B,C). 
• Step 3 - Go back to the (E,A) corner and measure the diagonal to (C,D).     .

Enter those lengths into this calculator and you will have an accurate measure of the area (TA).

The Total Area of a 5 Sided field has to be calculated based on three triangles (A,B,G), (G,F,C) and (E,F,D).  The area of the 5 sided field is the sum of those three triangles.

Once the triangles have been measured, on can use the formula for the area of a triangle based on the length of the three sides, which is:

        `A = sqrt((a+b+c)/2((a+b+c)/2-a)((a+b+c)/2-b)((a+b+c)/2-c))`

where:

• A is the area of the triangle
• a is the length of one side
• b is the length of one side
• c is the length of one side

Landscape fabric Information

Landscape fabric is a cloth (textile) material used in gardening and landscaping.  It's primary purpose it create areas of no plant growth except where the fabric is cut and  specific desirable plants are planted.  In this way, undesirable plants including weeds are block from growth by being denied sunlight. Since it is a fabric, landscaping fabric is subject to being blown away by wind until something heavy is on it, like decorative stones, or until fixed to the ground using garden staples.  Southwest Boulder & Stone (75 and 500 pack) and Vigoro (100 pack) are to manufactures of garden staples. 

Landscape fabric comes rolls of various sizes. A recent survey showed the following size options.

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Landscape Fabric Price Survey

Landscape Fabric Price Survey provides a data point of product pricing.  Pricing information is for convenience only, and there is no stated or implied guarantee that the products will be available at these prices in your area.  ALWAYS use local price information. 

Landscape Fabric Price Survey

• Retailer: Menards
• Survey Date: 5/21/24
• Survey Sample Size: 8
• Survey Prices:
  • Premium Product: 3'x50'
    • Price: $24.0
    • Price per Square Foot: $0.17
  • Mid Product: 3'x100'
    • Price: $24.99
    • Price per Square Foot: $0.08
  • Low Product: 4'x80'
    • Price: $16.84
    • Price per Square Foot: $0.05

These numbers were compiled using the Length Width Price Survey Tool and the Landscape Fabric Raw Price Data.

CAUTION: The pricing information provided is for calculating convenience with NO implied guarantees to the accuracy of the values listed. Authoritative sources should be sought to confirm any value before risking health or wealth on the veracity of the data. Furthermore, Calc gives no guarantee that you will be able to buy products at listed prices or even if they will be available.  The data provided is purely a convenience for making estimates, so we repeat, ALWAYS use local pricing and authoritative specifications.

Landscape Fabric Calculators

The Landscape Fabric Calculator suite has data and calculators associated with the purchasing and use of landscape fabric used in many lawn and garden applications.  The calculator includes the following functions:

• Landscape Fabric for Rectangle Area: Computes the number of rolls of landscape fabric need to cover a rectangular area such as a garden or planter based on the area's length and width and the length and width of the fabric in the rolls.
• Landscape Fabric for Non-squared Four Sided Area: Computes the number of rolls of landscape fabric need to cover a four sided (non-squared) area such as a garden or planter based on the area's length of sides, the length of a diagonal and the length and width of the fabric in the rolls.
• Landscape Fabric for Five Sided Area: Computes the number of rolls of landscape fabric need to cover a five sided area based on the area's length of sides, the length of two diagonals and the length and width of the fabric in the rolls.