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# How do you work out perimeter?

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James ShieldsPass Maths GCSE23 students helped

The perimeter is the distance around the outside of a shape. To work out the perimeter of a shape you need to know the lengths of all of the sides of the shape and then add them together. This will give you the perimeter of the shape.

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Lisa Banaghan1 students helped

Perimeter is the total length of the outside of a shape. This could any shape from a square to a dodecahedron. You just find the length of each side of the shape and add them together.

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Mohamed GalisExperienced and Dedicated Tutor in Mathematics183 students helped

Perimeter is the length of the outside shape. To find out the perimeter of a shape you have to add all the lengths. For example a square has 4 equal sides and each side is 3cm. To find the perimeter you have to do 3+3+3+3 = 12

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Solikha ShahobiddinovaExperienced maths tutor1 students helped

Add all the sides of the 2D shape

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Emma HassardVersatile tutor and undergraduate at University of Leicester1 students helped

Perimeter is the total distance around the outside of a shadow. Imagine a swimming pool. If you walk around the outer edge all the way around until you get back to your starting point, you've walked the perimeter. To calculate perimeter, simply add all the lengths of the sides together. E.g. The pool has 2 sides that are 10m and 2 sides that are 5m. 10+10+5+5=30m

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Marian KutsoatiResourceful tutor in physical, applied and social sciences at Imperial College.37 students helped

Perimeter is a measure of the aggregate of all sides. If a field has 4 sides of 25m then the perimeter will be 4*25=100m or 25+25+25+25+25=100m

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Thomas BrewerHard-working tutor and undergraduate at Lancaster University4 students helped

You add the sum of all sides together. For instance if each side of a square measured 20cm. The perimeter would be 20+20+20+20 and so would be 80cm. Hope this makes sense

Arsalan KhanPassionate tutor and undergraduate at aligarh muslim university1 students helped

The perimeter is the sum of all of its sides. It tells us about the measurement of its boundary from all around

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Alissa BaptistePassionate tutor and who is ready to teach!21 students helped

The perimeter is the length all around the shape. It is usually found ouf by adding all the sides together

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Usman Gul MohammedMaking Maths simpler and easier to grasp!1 students helped

Perimeter is the sum of all the sides on the outside of the shape

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George RobertsEnthusiastic Maths tutor and Engineering undergraduate158 students helped

The perimeter Is the sum of the lengths of every side of that particular shape. For example, for a rectangle with 4 sides, 2 of length 4cm and the other 2 of length 6cm. Then the perimeter would be 4+4+2+2=12cm.

Alina HussainHard-working tutor and who is ready to teach!11 students helped

The perimeter is when a measurement is taken of a shape. For example, to find the perimeter of a square, you will need to find a measurement of the whole square. This would be done by measuring how many centimetres one line is and then measure how many centimetres the other 3 lines are. You would then need to add up all 4 measurements of the square to give you the perimeter of the square.

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Sofiya HodgkinsonVersatile tutor and undergraduate at University of Turin259 students helped

Hey there! Well, a perimeter in the context of Maths is exactly what it is when we use it colloquially - e.g. surveying the perimeter... You look at the distance around an object, it might be a house, it might be a country... it might just be a bookshelf! You add the distances of the sides of the object, going all the way from point A around to reach that same point again.

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Stacey RebeccaPassionate tutor and undergraduate at The University of Exeter11 students helped

The perimeter is just all the sides of a shape added together- for example a square with a side of 2cm would have a perimeter of 8cm (4 x 2cm)

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Rhiannon PumphreyEnthusiastic and experienced teacher1 students helped

To find the perimeter you must add up the length of all the shape's sides. The total will be the perimeter of the shape.

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Karina Ng1 students helped

The perimeter is the sum of the lengths of the edges of the shape: in other words, it is a path that encompasses a shape. For a square, the perimeter is four times the length of an edge since all sides have the same length (e.g. if a square has a side length of 2cm, its perimeter is 2x4=8cm). For a rectangle, the perimeter will be the sum of the bases and the heights, i.e. 2 times (base+height) or base+base+height+height. To find the perimeter of a triangle, add up the lengths of the three sides. The same reasoning/method can be used for other shapes and polygons. However, the perimeter of a circle, also called the circumference, has to be calculated using the equation 2Οr, where Ο (pi) is a constant approximately equal to 3.14 and r is the radius of the circle (the radius of a circle is the distance from the centre of the circle to a point on the circumference). The equation Οd can also be used to find the perimeter of a circle, where d is the diameter of the circle (a line that passes through the centre of a circle and has end-points that lie on the circumference; two times the radius of a circle). The units of perimeter are the same as the units of the sides/edges/radius of the shape (e.g. if a circle has a radius of x cm, it has a circumference of y cm).

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Ryan LaiPhysics Student at UCL | Past Teaching Experience | Online Tutoring Available557 students helped

The perimeter is the length of the outline of a shape. To find the perimeter of a rectangle or square you have to add the lengths of all the four sides. There are different units for perimeter and area The perimeter has the same units as the length of the sides of rectangle or square.