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Practical Geometry

Short Answer Type

21. Can you construct the quadrilateral PLAN if PL = 6 cm, LA = 9.5 cm, ∠P = 75°, ∠L = 150° and ∠A = 140°? (Hint: Recall angle-sum property)

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22. In a parallelogram, the lengths of adjacent sides are known. Do we still need measures of the angles to construct as in the example above?

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23. Construct the following quadrilateral:
Quadrilateral DEAR
DE = 4 cm
EA = 5 cm
AR = 4.5 cm
∠E = 60°
∠A = 90°

Steps of construction:
I. Draw a line segment DE = 4 cm.
II. At E, draw

EX with rightwards arrow on top

such that

angle DEX space equals space 60 degree.

III. From

EX with rightwards arrow on top comma space

cut-off EA = 5 cm.
IV. At A, draw ray

AY with rightwards arrow on top

such that

angle EAY space equals space 90 degree.

V. From

EY with rightwards arrow on top comma space

cut-off AR = 4.5 cm.
VI. Join R and D.

Steps of construction:I. Draw a line segment DE =

Thus, DEAR is the required quadrilateral.

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24. Construct the following quadrilateral:
Quadrilateral TRUE
TR = 3.5 cm
RU = 3 cm
UE = 4 cm
∠R = 75°
∠U = 120°

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25. Construct a quadrilateral ABCD, where AB = 4 cm, BC = 5 cm, CD = 6.5 cm and

angle straight B space equals space 105 degree

and

angle straight C space equals space 80 degree.

Here, we first drew BC. Instead, what could have been be the other starting points?

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26.

We used some five measurements to draw quadrilaterals so far. Can there be different sets of five measurements (other than seen so far) to draw a quadrilateral? The following problems may help you in answering the question.
(i) Quadrilateral ABCD with AB = 5 cm, BC = 5.5 cm, CD = 4 cm, AD = 6 cm and ∠B = 80°.
(ii) Quadrilateral PQRS with PQ = 4.5 cm, ∠P = 70°, ∠Q = 100°, ∠R = 80° and ∠S = 110°.
Construct a few more examples of your own to find sufficiency/insufficiency of the data for construction of a quadrilateral.

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