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The perimeter of a full circle (circumference) is "pi" times the diameter. So the perimeter of a semi-circle will be half that; Perimeter = (pi/2) x (diameter).

Q: Work out the perimeter of the semi-cirle when diameter is 15cm?

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The perimeter of a circle is called it circumference, "C". To calculate it, multiply its diameter by the constant, pi. Pi is roughly equal to 3.14159265. So, let's say you have a circle with a 10-foot diameter. Then C=10 x 3.14159265 = 31.42 (rounded off).

Divide the irregular figure into manageable pieces and work out their individual areas, sum the areas to that of the original figure. Measure the perimeter.

You add the three sides. This "circumference" is usually called perimeter, by the way.You add the three sides. This "circumference" is usually called perimeter, by the way.You add the three sides. This "circumference" is usually called perimeter, by the way.You add the three sides. This "circumference" is usually called perimeter, by the way.

Too many dimensions have been given to work out an answer.

To find the circumference of a circle, you have to multiply Pi and the Diameter. This means that to work out the answer you multiply Pi by 1.25. This equals 3.92699081, which rounded equals 3.93 (2dp) - the circumference of a circle with a 1.25 diameter.

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Perimeter is the total of all the sides. Let's assume your part-question relates to a rectangle. Four sides: 2 x 8cm and 2 x 15cm. I'm sure you can work it out from there...

The circumference of a circle is pi times the diameter. If you want a third of that, divide by 3. (Pi is approximately 3.14) Then to get the perimeter add the diameter to the circumference of the 1/3 of the circle.

To find the circumference (distance around) of a circle, use the formula pi x d (d=diameter)

for polygons, add up the lengths of all the sides. for circles, multiply the diameter of the circle squared by pi (3.14)

To work out perimeter you always add I need to remember that

Plus the side

The perimeter of a circle is called it circumference, "C". To calculate it, multiply its diameter by the constant, pi. Pi is roughly equal to 3.14159265. So, let's say you have a circle with a 10-foot diameter. Then C=10 x 3.14159265 = 31.42 (rounded off).

In meters

Firstly, u need 2 know ur diameter of the stirrup used. Then get the perimeter of ur concrete work. After which you will less your cover, but remmeber that your diameter stirrup will be minus from your cover in meter, then u can now less cover round the perimeter of your concrete and lastly you will add your bending length(i.e the length it use to over_laps each other. Which is mostly 75mm.

Measure the diameter of the circle,this is a line taken right across the circle that goes through the centre. Now multiply by pi =3.142 and divide by 2 to get the length of half the circumference.

diameter = 2rarea = pi*r^2

It is pi r 2