an irregular figure is when it is open or have curved lines.
by subtracting
a irregular figure is not a particular shape it may have two or more figures in to make a irregular figure
You approximate your irregular figure lots of small figures of known shapes. For example, you can divide it into lots of thin vertical (or horizontal) stripes, each of which is approximately a rectangle.
A trapezoid or an irregular pentagon are two examples.
A regular figure has no curves, no gaps, and ALL lines must be connected. An irregular figure is the opposite of that.
Area. Very few 2-dimensional figures can be measured by length and width - rectangles (and stretching the terminology) triangles and parallelograms. Certainly not circles, stars, irregular polygons, other irregular shapes.
It is said to be an irregular figure such as a scalene triangle.
length times(x) width * * * * * Very few 2-dimensional figures are measured by length and width - rectangles (and stretching the terminology) triangles and parallelograms. Certainly not circles, stars, irregular polygons, other irregular shapes.
Plane figures. There are infinitely many of them - some regular, others irregular.
If the figure is irregular, you can't calculate its area (for example) with some simple formula. You need to use integration - which basically means to divide the figure into many narrow strips, which you assume to be rectangles.
A heptagon. Note that an irregular heptagon can have even sides - if the angles are not all the same.
Regular polygons with even sides if there are 6 or more of them; selected irregular polygons with seven or more odd numbers of sides.