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...
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Divide the perimeter length by 4 ie 8cm and square the result ie 8cm x 8cm = 64sq cm
find the perimeter and area of a rectangle that is 15cm long and 5cm wide
Oh, what a delightful question! To find the perimeter of a shape, you simply add up all the sides. So for a shape with sides measuring 7cm, 8cm, and 12cm, you would add them together to find the total perimeter. In this case, the perimeter would be 7cm + 8cm + 12cm = 27cm. Just imagine all those sides coming together like old friends for a lovely little stroll around the shape!
To determine the number of triangles with a perimeter of 15cm, we need to consider the possible side lengths that can form a triangle. The triangle inequality theorem states that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side. With a perimeter of 15cm, the possible side lengths could be (5cm, 5cm, 5cm) for an equilateral triangle, (6cm, 5cm, 4cm) for an isosceles triangle, or (7cm, 5cm, 3cm) for a scalene triangle. Therefore, there are 3 possible triangles that can have a perimeter of 15cm.
To find the perimeter of something all you have to do is, MEASURE THE DISTANCE AROUND THE OBJECT, for example if you have a triangle and the left side is 8cm, the right side is 5cm, and the bottom is 3cm, add the three measurements, 8cm + 5cm + 3cm = 16cm