AN INTRODUCTIONAN INTRODUCTION

MMEEAANNIINNGG

Geometrical Geometrical figures are figures are said to besaid to be

congruentcongruent if they have if they have same shape same shape and same sizeand same size

covers it covers it exactlyexactlyF1 F2

FigureFigure F1F1 & Figure F2Figure F2

are congruent

if F1 when superposed over F2F2

Congruency symbolCongruency symbol

FIND THE CONGRUENCY IN THESE RECTANGULAR PLATES

CAN YOU SEE, THE CONGRUENCY IN THESE

ARCHES

FIND THE SETS OF FIND THE SETS OF CONGRUENT FIGURES HERECONGRUENT FIGURES HERE

SEE THE CONGRUENT FIGURES

SEE THE CONGRUENT FACES

CONGRUENT SHAPES

CONGRUENT SHAPESCONGRUENT SHAPES

CHOOSE SHAPES

SHAPES

congruent figurescongruent figures

Line segments are congruent if their lengths are equal

Squares are congruent if one of their sides equal

Circles are congruent if their radii equal

a a

PENTOGONPENTOGON

congruent figurescongruent figures

An AngleAn Angle

Choose the congruent figuresChoose the congruent figures

1

2

3

4

5

6

7

8

9

10

11

1213

14

15

16

Same shape butSame shape but not same size not same size

Two triangles are congruent if three angles and three sides of one triangle are equal to the corresponding three angles and three sides of another triangle

Congruent trianglesCongruent triangles

Corresponding PartsCorresponding PartsHere Here C coincides with C coincides with R , R , A with A with P & P & B with B with Q Q We call the pairs We call the pairs Corresponding partsCorresponding parts (angles) (angles)

A B

C

PQ

R

Write the other corresponding parts (sides)

Write the corresponding partsWrite the corresponding parts

A

B C

R

Q

P

D

E

F

K

LM

ABC RPQDEF MLK

AssignmentAssignment

State true or falseState true or false

1.When a line segment is bisected we 1.When a line segment is bisected we get two congruent line segmentsget two congruent line segments

2.When an angle is bisected we obtain 2.When an angle is bisected we obtain two angles which are congruent to two angles which are congruent to each othereach other

3.Circles always have same shape and 3.Circles always have same shape and same sizesame size

CONDITIONS FOR CONDITIONS FOR CONGRUENCECONGRUENCE

SSSSSSSASSASASA also AASASA also AASRHSRHS

SSSSSS

SASSAS

ASAASA

RHSRHSLET US LEARN ABOUT THIS IN

LESSON-2