Last updated at Dec. 8, 2016 by Teachoo

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Ex 6.3, 1 (iv) State which pairs of triangles in figure are similar. Write the similarity criterion used by you for answering the question and also write the pairs of similar triangles in the symbolic form In ∆ 𝑀𝑁𝐿 and ∆𝑄𝑃𝑅 ∠𝑀 = ∠𝑄 =70° Also, 𝑀𝑁/𝑄𝑃=2.5/5 = 25/(5 ×10)=1/2 𝑀𝐿/𝑄𝑅=5/10=1/2 So, 𝑀𝑁/𝑃𝑄=𝑀𝐿/𝑄𝑅=1/2 Hence, by SAS similarity criterion for two triangles ∆ 𝑀𝑁𝐿∼∆𝑄𝑃𝑅 Ex 6.3, 1(v) State which pairs of triangles in figure are similar. Write the similarity criterion used by you for answering the question and also write the pairs of similar triangles in the symbolic form In ∆ 𝐴𝐶𝐵 and ∆ 𝐹𝐷𝐸 ∠ A = ∠ F = 80° 𝐴𝐵/𝐹𝐷=2.5/5 = 25/(5 ×10) =1/2 𝐴𝐶/𝐹𝐸=𝐴𝐶/6 AC is not given So, 𝐴𝐵/𝐷𝐹 ≠ 𝐴𝐶/𝐸𝐹 So , ∆ 𝐴𝐶𝐵 and ∆ 𝐹𝐷𝐸 are not similar .

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