D and E are respectively the points on the sides AB and AC of a triangle ABC such that AD =2cm, BD=4cm , BC=9cm and DE//BC. then, length of DE ( in cm) is :
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Two forces of magnitudes k cos A and k cos B act along CA, CB of a triangle ABC . Prove that their resultant is k sin C. (B.Sc.86 Calicut; B.Sc. 79, 8 M.K.U.) [Hint:- Use the result that in a triangle cos^ 2 A+cos^ 2 B+cos^ 2; C=1-2 cos A cos B cos C]
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Photography is the art, application, and practice of creating durable images by recording light, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film.
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