Question

Answer this fastly guys

3.In the figure, ABCD is a parallelogram. if AB = 4.5 cm then find other sides of the parallelogram. When its perimeter is 21 cm.

4. In triangle ABC, DE is parallel to BC and D is the midpoint of AB. find the perimeter of triangle ABC when AE is equal to 4.5 cm.

5. A diagonal of a parallelogram divides into how many congruent triangles?

6. By joining four collinear points in a plane, we get a figure. name it.

7. Name the various kinds of parallelogram.

Answer 1

3.cd=ab=4.5cm

bc=ad=21-9/2=6cm.

4.perimeter=9×3=27cm

5.2

6.line segment

7.4 types of Parallelograms  1. ...

Rectangle A parallelogram with 4 right angles. ...

Rhomboid  Two pairs of parallel sides. ...

Rhombus  Parallelogram with all sides equal in length. ...

Square  Parallelogram with all sides equal in length.

2.a=c=112,d=b=68

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Answer 2

4 .D is the mid point of AB and DE//BC
E is the mid point of AC and DE=1/2 BC
2DE=BC
2×5 cm =BC
BC=10 cm
DB=3.5 cm
AB=2(DB)=2×3.5 cm =7 cm
AC=2(AE)=2×4.5=9 cm
perimeter of ∆ABC=AB+BC+CA
=7+10+9
=26 cm

5.A diagonal of a parallelogram divides it into two congruent triangle.

6.Quadrilateral

7.Rectangle, Rhombus,square

2.opp.angles are equal.
angle B=angle D
angle D=68°
angle B and angle C are supplementary
angle B+angle C=180°
68°+angle C =180°
angle C=180°-68°
angle C=112°
opp.angles are equal.
angle C=angle A
angle A=112°

3.opp.sides are equal.
AB=CD
CD=4.5 cm
BC=AD
AB+CD+BC+AD=21 cm
AB+AB+BC+BC=21 cm
2(AB+BC)=21
2(4.5+BC)=21
(4.5+BC)=21/2
=10.5 cm
BC=10.5-4.5=6 cm