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Math Help - Similar and Congruent Qns (Help)

  1. #1
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    Similar and Congruent Qns (Help)

    Please show me working for: I really need to learn how to solve this kind of questions.
    bii: The answer is 7.05cm^2


    And,
    5c: Answer is 39/25
    Attached Thumbnails Attached Thumbnails Similar and Congruent Qns (Help)-2.jpg   Similar and Congruent Qns (Help)-1.jpg  
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  2. #2
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    Re: Similar and Congruent Qns (Help)

    Hey Aro...
    first of all you have to revise the following theorem due to Thales a greek Mathematician ..
    go here : Intercept theorem - Wikipedia, the free encyclopedia
    in your case 3/1.8 = 3.5 /2.1 i.e 5/3 = 5/3 the ratio are the same...therefore the SEGMENTS AB and DC are parallel..and therefore the triangles ABE and ACD are similar....

    the second figure reveals that angle B = angle D and angle A is common for both triangles therefore the angle c wil be equal to the angle E this ensures that these triangles are similar...

    revise the similar triangles please go here Similarity (geometry) - Wikipedia, the free encyclopedia

    the rest are easy....
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  3. #3
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    Re: Similar and Congruent Qns (Help)

    I do know how to find which are similar sides and angles.
    What i dont know is finding the ratio between the areas at 1 figure.
    Need help urgent for:
    Bii and 5c
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