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CM and RN are respectively the medians of triangle ABC and triangle PQR .If triangle ABC ~triangle PQR ,prove that i. triangle AMC~triangle PNR ii CM/RN =AB/PQ iii triangle CMB~ triangle RNQ?
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CM and RN are respectively the medians of triangle ABC and triangle PQ...
Proof of Similarity and Proportions in Triangles

Similarity of Triangles
To prove that triangle AMC~triangle PNR, we need to show that they have the same shape.


  • Since CM and RN are medians, they divide their respective triangles into two equal halves.

  • Therefore, we can say that AM = MB and PN = NQ.

  • Also, we know that triangle ABC~triangle PQR.

  • Therefore, we have AB/PQ = BC/QR = AC/PR.

  • Now, we can say that AM/PN = AB/PQ and BM/QN = BC/QR.

  • Substituting the values we know, we get AM/PN = BM/QN = AC/PR.

  • Therefore, we can conclude that triangle AMC~triangle PNR.



Proportions in Triangles
To prove the second and third statements, we need to use the properties of medians.


  • Let's consider the triangle ABC and its medians CM and BN.

  • By the properties of medians, we know that CM = 1/2AB and BN = 1/2AC.

  • Similarly, for triangle PQR and its medians RN and QM, we have RN = 1/2PQ and QM = 1/2PR.

  • Now, we need to prove that CM/RN = AB/PQ and CMB~RNQ.

  • Using the values we know, we get CM/RN = (1/2AB)/(1/2PQ) = AB/PQ.

  • Therefore, we have proved the second statement.

  • For the third statement, we can use the fact that medians divide a triangle into six smaller triangles of equal area.

  • Therefore, we have two sets of three triangles each, which are similar to each other.

  • These sets are triangle CMB, triangle AMN, and triangle ACB, and triangle RNQ, triangle QNP, and triangle PQR.

  • Therefore, we can conclude that triangle CMB~triangle RNQ.



Therefore, we have proved all the three statements.
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CM and RN are respectively the medians of triangle ABC and triangle PQR .If triangle ABC ~triangle PQR ,prove that i. triangle AMC~triangle PNR ii CM/RN =AB/PQ iii triangle CMB~ triangle RNQ?
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