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Theorem 7.4 (SSS congruence rule) : If t...

Theorem 7.4 (SSS congruence rule) : If three sides of one triangle are equal to the three sides of another triangle, then the two triangles are congruent.

Text Solution

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let `PQR` and `XYZ` be two traingles,
Steps:---
draw xw intersecting yz such that
`/_WYZ=/_PQR` and
`WY=PQ`
Proof:---
In `/_\ PQR` and `/_\ WYZ`
`PQ=WY`
`/_PQR = /_WYZ` ...
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Assertion (A) : If two triangle have same perimeter , then they are congruent. Reason (R) : If under a given correspondence, the three sides of one triangle are equal to the three sides of the other triangle, then the two triangles are congruent.

If any two angles and a non-included side of one triangle are equal to the corresponding angles and side of another triangle, then the two triangles are congruent. GIVEN : Two s A B C and D E F such that /_A=/_D ,/_B=/_E ,B C=E F TO TROVE : A B C~=D E F Figure

Knowledge Check

  • Consider the following statements : (1) If three sides of a triangle are equal to three sides of another triangle, then the triangles are congruent. (2) If three angles of a triangles are equal to three angles of another triangle respectively, then the two triangles are congruent. Of these statements :

    A
    1 is correct and 2 is false
    B
    both 1 and 2 are false
    C
    both 1 and 2 are correct
    D
    1 is false and 2 is correct
  • Consider the following statements : If three sides of a triangle are equal to three sides of another triangle, then the triangles are congruent. If three angles of a triangle are equal to three angles of another triangle respectively, then the two triangles are congruent. Out of these statements :

    A
    1 is correct and 2 is false
    B
    both 1 and 2 are false
    C
    both 1 and 2 are correct
    D
    1 is false and 2 is correct
  • If in two right triangles, the hypotenuse and one side of one triangle are equal to the hypotenuse and one side of the other triangle, then the two triangles are congruent. 1. PL is an altitude from P of DeltaPQR on QR such that QL = LR. Then,

    A
    `angleQ lt angleR`
    B
    `angleQ=angleR`
    C
    `angleQ gt angleR`
    D
    `angleP = angleR`
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    Which of the following statements are true and which of them are false? (i) All squares are congruent. (ii) If two squares have equal areas, they are congruent. (iii) If two figures have equal areas, they are congruent. (iv) If two triangles are equal in area, they are congruent. (v) If two sides and one angle of a triangle are equal to the corresponding two sides and angle of another triangle, the triangles are congruent. (vi) If two angles and any side of a triangle are equal to the corresponding angles and the side of another triangle then the triangles are congruent. (vii) If three angles of a triangle are equal to the corresponding angles of another triangle then the triangles are congruent. (viii) If the hypotenuse and an acute angle of a right triangle are equal to the hypotenuse and the corresponding acute angle of another right triangle then the triangles are congruent. (ix) If the hypotenuse of a right triangle is equal to the hypotenuse of another right triangle then the triangles are congruent.

    Angle Angle Side (AAS) Congruence-If any two angles and a non-included side of one triangle are equal to the corresponding angles and side of another triangle; the two ttriangles are congruent.

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