Кафедра: Математика

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Irregular quadrilaterals
Other polygons

Right-angles trapeziums are trapeziums with a right angle.

Isosceles trapeziums are trapeziums where the laterals sides are equal but not parallel.

Scalene trapeziums are trapeziums that fall into neither category.

Kites are quadrilaterals where two pairs of adjacent sides are equal and one pair of opposite angles is equal.

Irregular quadrilaterals are any quadrilaterals that do not fit into one of the groups above.

Calculating the area of these shapes can be very easy. For parallelograms, simply multiply the base with the height, the way with do with triangles, except we don't need to divide by two. The square is especially easy: just square one of the sides, which would be the length. For the others, we can cut them up into bite-sized pieces before we calculate. For example, we can dissect the right-angled trapeziums into a right-angled triangle and a rectangle.

The perimeter of these shapes are just as easy. For rectangles, we simply add up the length and the width, then multiply by two. You can simply multiply the length of a square by four. The isosceles trapeziums are just as easy: multiply one of the lateral sides by two, then add it up with the other two. The kite is easy as well: Just add up the two different sides and multiply that by two. For the rest, you can just add up everything.

Other polygons

Many other polygons have a name.

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