Please show me working for: I really need to learn how to solve this kind of questions.

bii: The answer is 7.05cm^2

http://i886.photobucket.com/albums/a...g?t=1365172580

And,

5c: Answer is 39/25

http://i886.photobucket.com/albums/a...g?t=1365172741

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- Apr 6th 2013, 07:40 AMAroperaltaSimilar 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

http://i886.photobucket.com/albums/a...g?t=1365172580

And,

5c: Answer is 39/25

http://i886.photobucket.com/albums/a...g?t=1365172741 - Apr 6th 2013, 09:56 AMMINOANMANRe: 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.... - Apr 6th 2013, 05:09 PMAroperaltaRe: 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