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|dw:1360331199543:dw|

you find the lengths of the triangle using pyth. theorem

then use the principle of sin(theta)=opp/hype, and tan(theta)= sin.cos or =opp/dj

|dw:1360331698436:dw|

tan(theta)=sin(theta)/cos(theta)

cos is adj/hype

but here tan theta is not less than 0(zero)

sin(theta)=opp/hype

tan(theta)=opp/adj

recheck your question

that condition confused me as well

or its an error by the book or ur teacher

you can use another method to solve this

\[\sin^2(\theta) = 1 - \cos^2(\theta)\]

=1-(4/7)^2