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Congruent triangles. class VII. Lesson 1. AN INTRODUCTION. M E A NING. Geometrical figures are said to be congruent if they have same shape and same size. Figure F1. & Figure F2. are congruent. covers it exactly. if F1 when superposed over F2. F1. F2. . Congruency symbol.
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Congruent triangles class VII Lesson 1 AN INTRODUCTION
MEANING Geometrical figures are said to becongruentif they have same shape and same size
FigureF1 &Figure F2 are congruent covers it exactly ifF1when superposedoverF2 F1 F2
Congruency symbol
congruent figures Squares are congruent if one of their sides equal Circles are congruent if their radii equal Line segments are congruent if their lengths are equal a a
An Angle PENTOGON congruent figures
12 1 5 13 14 8 3 7 11 16 2 9 10 4 6 15 Choose the congruent figures
Same shape but not same size
Congruent triangles 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
R C A B Q P Corresponding Parts Here C coincides with R , A with P & B with Q We call the pairs Corresponding parts (angles) Write the other corresponding parts (sides)
Write the corresponding parts DEF MLK ABC RPQ K P R M L A F D Q C B E
Assignment State true or false 1.When a line segment is bisected we get two congruent line segments 2.When an angle is bisected we obtain two angles which are congruent to each other 3.Circles always have same shape and same size
CONDITIONS FOR CONGRUENCE • SSS • SAS • ASA also AAS • RHS
SSS SAS ASA RHS LET US LEARN ABOUT THIS IN LESSON-2