ABCD is a quadrilateral with angle is equal to 80 Angle B 40 MLC 140 angle D hundred in a) a b c of a Trapezium b) is ABCD a parallelogram
Answers
GIVEN :
ABCD is a quadrilateral with \angle A=80^\circ∠A=80
∘
\angle B=40^\circ∠B=40
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, \angle C=140^\circ∠C=140
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and \angle D=100^\circ∠D=100
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TO JUSTIFY :
1. Is ABCD a trapezium
2 Is ABCD a parallelogram
SOLUTION :
Given ABCD is a quadrilateral with \angle A=80^\circ∠A=80
∘
\angle B=40^\circ∠B=40
∘
, \angle C=140^\circ∠C=140
∘
and \angle D=100^\circ∠D=100
∘
From the definition of quadrilateral, the given quadrilateral ABCD is a trapezium.
For :
Quadrilateral ABCD is a trapezium because properties of parallelogram does not exists.
The parallel sides are called bases.
The other two non-parallel sides are called legs.
If the two non-parallel sides are equal and form equal angles at one of the bases, the trapezium is an isosceles trapezium.
Trapezium is a quadrilateral with one pair of opposite parallel sides.
Opposite angles of a parallelogram are congruent but in the given quadrliateral ABCD none of the opposite angles are equal.(refer figure)
2) The adjacent angles of a parallelogram are suplementary but in the given quadrliateral ABCD its adjacent angles exceeds 180 degree
The opposite or facing sides of a parallelogram are of equal lengths and their opposite angles are of equal measuring angle.
Hence ABCD quadrilateral is a Trapezium
