ICSE Class 9 Answered
In triangle ABC, AD is perpendicular to BC. Sin B = 0.8 , BD = 9 cm and tan C = 1. Find the length of AB , AD , AC and DC .
Asked by sactalkmail | 19 Feb, 2018, 18:45: PM
![begin mathsize 16px style sinB equals 0.8 rightwards double arrow cosB equals square root of 1 minus sin squared straight B end root equals 0.6
In space increment ABD comma
cosB equals BD over AB
0.6 equals 9 over AB
AB equals 15 space cm
Similarly space find space sinB equals 12 space cm space and space AD equals CD equals 12 space cm
Using space secC equals AC over CD space you space will space get space AC equals 12 square root of 2 space cm
end style](https://images.topperlearning.com/topper/tinymce/cache/cd47aefc51944f048be9d694137a2ab7.png)
Answered by Sneha shidid | 19 Feb, 2018, 18:58: PM
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