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TRAPEZOID

PRESENTED BY :

MOCH. FATHUL HILAL

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Do you know about Trapezoid?

Names of Trapezoid

Scalene trapezoid

Isosceles trapezoid

Right trapezoid

Properties of Trapezoid The sum of consecutive angle

between two parallel sides are 180O

Isosceles Trapezoid :- The length of diagonals are equal- The base angle are equal- The length of sides (not parallel

sides) are equal

Definition of Trapezoid A trapezoid is a quadrilateral with

exactly one pair of parallel sides.

Perimeter of Trapezoid Formula to calculate perimeter of

trapezoid

P = a + b + c + d

Why ?

Area of Trapezoid Formula to calculate area of

trapezoid

A = 1/2 x (a + b) x t

Why ?

Exercise 1

Determine the perimeter and area of trapezoid below!

A B

CD

10 cm 6 cm

12 cm

E

Exercise 2

Mr. Karyo has a land which shape is isosceles trapezoid. The length of its parallel sides are 100 m and 30 m. A part of the land will be sold, such that remaining the square land with 30 m in length . If the price for the land is Rp 75.000/m2 , then how much money will be got by Mr. Karyo?

Exercise 3

One of the parallel sides of a trapezoid is twice the other. The height of the trapezoid is the average of the parallel sides. If the area of trapezoid is 324 cm2, find the lengths of the height and parallel sides of the trapezoid!

Exercise 3

Determine height, and parallel sides of trapezoid below!

A = 324 cm a = 2b t = (a + b) /2

A B

CD

t cm

b cm

a cm

Exercise 4

The proportion of two parallel sides of isosceles trapezoid are 2 : 5. Given an angle of one leg trapezoid is 60 degrees.The length of leg = 10 cm, height = 8 cm, and the Area = 80 cm.

Determine : All angle of trapezoid The length of parallel sides Perimeter of trapezoid

Conclusion

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