THIS PPT IS ON
UNDERSTANDING
QUADRILATERALS
What is Quadrilateral ? A quadrilateral is a closed figure with four
straight sides. You can make a quadrilateral by taking (or imagining) anything straight and thin you might have handy: pens, toothpicks, chopsticks, etc. A square is one type of a special quadrilateral. However, just to make it interesting, try to use four things that are not all the same length. Place your objects so that each end of one touches the end of another. I am going to use pencils to form my quadrilateral, as you can see below. I place each pencil tip so that it touches the eraser of another pencil. That way, I get a closed figure, meaning there are no gaps between sides, and no side extends past the end of another side. Now we have our quadrilateral with four straight sides.
Name the Quadrilaterals
12 3
4 5 6
Rectangle Irregular Rhombus
Parallelogram Trapezoid Square
1.
Square: Quadrilateral with four equal sides and four right angles (90 degrees)
Indicates equal sides
Box indicates 900 angle
2.
Rectangle: Quadrilateral with two pairs of equal sides and four right angles (90 degrees)
Indicates equal sides
Box indicates 900 angle
3.
Parallelogram: Quadrilateral with opposite sides that are parallel and of equal length and opposite angles are equal
Indicates equal sides
4.
Rhombus: Parallelogram with four equal sides and opposite angles equal
Indicates equal sides
5.
Trapezoid: Quadrilateral with one pair of parallel sides
Parallel sides never meet.
6.
Irregular shapes: Quadrilateral with no equal sides and no equal angles
THANK YOU
FROM GOURAV SHARMACLASS-8TH DROLL NO-41