tg<B=tg<(90-<A)=ctg<A=21/20
HB=CB*cos<B
1+tg^2<B=1/cos^2<B
1+441/400=1/cos^2<B
cos^2<B=400/841
cos<B=20/29
HB=29*20/29=20
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tg<B=tg<(90-<A)=ctg<A=21/20
HB=CB*cos<B
1+tg^2<B=1/cos^2<B
1+441/400=1/cos^2<B
cos^2<B=400/841
cos<B=20/29
HB=29*20/29=20