A Trapezium and its properties
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Concept # A Trapezium and its properties
Learning objectives
- A quadrangle with only two opposite sides parallel is called a trapezium, or trapezoid.
- The parallel sides are called the bases of the trapezium and the other two sides are called the legs or the lateral sides.
- If the legs are equal in length, then this is an isosceles trapezium.
- The distance between the bases is called height of trapezium.
Notes for teachers
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Concept #2. Measurements in Trapezium
Learning objectives
- The trapeium contains two parallel sides and two non-parallel sides.
- The area of trapezium is found by viewing it as a parallelogram.
- The area of trapezium is 1/2(a+b)h where a and b are its parallel sides and h is the perpendicular distance between them.
- The perimeter of a trapezium is obtained by sum of its 4 sides.
Notes for teachers
- The area of most figures can be expressed in terms of its dimensions.
- The area of most composite figures can be calculated using the area of primary figures.
Activity No # Find area of trapezium with given clues.
- A small circle is placed inside a square just touching the sides. The square is on top of a big circle with its vertices on the circle. Finally the big circle is on top of a trapezium which has its sides just touching the circle. Using the measurements and clue given, find the area of the trapezium.
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Concept # 3.Construction of Trapezium
Learning objectives
Notes for teachers
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Concept # 4. Isosceles trapezium
Learning objectives
Notes for teachers
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