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U n d e r s t a n d n g
Q u a d r i l a t e r a l s
Page 2


U n d e r s t a n d n g
Q u a d r i l a t e r a l s
Plane Surface
A plane surface is a flat, two-dimensional
geometric figure that extends infinitely
in all directions.
Page 3


U n d e r s t a n d n g
Q u a d r i l a t e r a l s
Plane Surface
A plane surface is a flat, two-dimensional
geometric figure that extends infinitely
in all directions.
Plane Curve
A curve is a flat shape created by
connecting multiple points without lifting
the drawing instrument from the surface.
Page 4


U n d e r s t a n d n g
Q u a d r i l a t e r a l s
Plane Surface
A plane surface is a flat, two-dimensional
geometric figure that extends infinitely
in all directions.
Plane Curve
A curve is a flat shape created by
connecting multiple points without lifting
the drawing instrument from the surface.
Curves
Types of
Page 5


U n d e r s t a n d n g
Q u a d r i l a t e r a l s
Plane Surface
A plane surface is a flat, two-dimensional
geometric figure that extends infinitely
in all directions.
Plane Curve
A curve is a flat shape created by
connecting multiple points without lifting
the drawing instrument from the surface.
Curves
Types of
Open Curve
An open curve is a
curve which does not
cut itself.
Closed Curve
 a closed curve is a
curve which cuts itself.
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FAQs on PPT: Understanding Quadrilaterals - Mathematics (Maths) Class 8

1. What are the properties of a quadrilateral?
Ans. A quadrilateral is a polygon with four sides and four angles. The properties of a quadrilateral include having a total of 360 degrees for its interior angles, opposite sides being parallel, and consecutive angles adding up to 180 degrees.
2. How many types of quadrilaterals are there?
Ans. There are various types of quadrilaterals, including squares, rectangles, parallelograms, rhombuses, trapezoids, and kites. Each type has its unique properties and characteristics.
3. How can you determine if a quadrilateral is a parallelogram?
Ans. A quadrilateral is a parallelogram if its opposite sides are parallel and equal in length. Additionally, its opposite angles are also equal. These properties help identify a quadrilateral as a parallelogram.
4. What is the formula to find the area of a quadrilateral?
Ans. The formula to find the area of a quadrilateral depends on the type of quadrilateral. For example, the area of a square is side length squared, while the area of a trapezoid is calculated using the formula: 1/2 * (sum of parallel sides) * height.
5. How can you classify a quadrilateral based on its angles and sides?
Ans. Quadrilaterals can be classified based on their angles and sides. For example, if all angles are right angles and all sides are equal, the quadrilateral is a square. If opposite sides are parallel and equal in length, it is a parallelogram. Understanding these properties helps classify quadrilaterals accurately.
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