# The collar

The collar on the dress has the shape of an annulus 6 cm wide. The circumference of the inner circle is 31.4 cm. How much cm2 of fabric is needed to make one collar?

S =  301.4973 cm2

### Step-by-step explanation:

We will be pleased if You send us any improvements to this math problem. Thank you!

#### You need to know the following knowledge to solve this word math problem:

We encourage you to watch this tutorial video on this math problem:

## Related math problems and questions:

• Round skirt
The cut on the round skirt has the shape of an annulus. Determine how much m² of fabric will be consumed on an 80 cm long skirt. The circumference of the waist is a circle with a smaller radius and is 69 cm.
• Tailor
Tailor has an estimated 11 meters of 80 cm wide fabric. He will shape wholly 7 rectangles measuring 80 x 150 cm and nothing fabric does not remain. How many fabric he have?
• Annulus
Calculate the area of two circles annulus k1 (S, 3 cm) and k2 (S, 5 cm).
• The carpet
How many meters of carpet 90 cm wide need to cover floor room which has a rectangular shape with a lengths 4.8 m and 2.4 m if the number of pieces on the carpet is needed to be lowest?
• Annulus
The radius of the larger circle is 8cm, the radius of smaller is 5cm. Calculate the contents of the annulus.
Calculate the radius of the quadrant, which area is equal to area of circle with radius r = 15 cm.
• Circle - easy 2
The circle has a radius 6 cm. Calculate:
• Circle
How big is an area of a circle if its circumference is 80.6 cm?
• The hollow cylinder
The hollow cylinder has a height of 70 cm, an outer diameter of 180 cm, and an inner diameter of 120 cm. What is the surface of the body, including the area inside the cavity?
• The number
The number of 1 cm cubes required to make 4 cm cube is?
• Gold fabric
Katy and her girlfriends went to the store to buy supplies to make a costume for Katy's school play. They needed 7 ½ meter of gold fabric. If each meter costs 3.4 USD, how much will 7 ½ meters cost?
• Sidewalk
The city park is a circular bed of flowers with a diameter of 8 meters. Around it, the whole length is 1-meter wide sidewalk. What is the sidewalk area?
• Wall painting
The wall is 4 meters wide and 2 meters high. The window in the wall has dimensions of 2x1,8 meters. How many liters of color is needed to paint two-layer these walls, if the 1 m2 needs 1 liters of paint?
• Annulus
Two concentric circles form an annulus of width 10 cm. The radius of the smaller circle is 20 cm. Calculate the content area of annulus.
• Sandbox
How much m3 of sand is needed to fill the sandbox on the field, if it has the shape of a circle with a diameter of 3 m and is 25 cm deep?
• Circle - simple
Calculate the area of a circle in dm2 if its circumference is 31.4 cm.
• Bathroom 2
A bathroom is 2.4 meters long and 1.8 meters wide. How many square tiles 1 dm on each side are to be used to cover it?