Question

in a triangle ac=16, bc=12Find ad if angel b, c& d are respectively 80, 70 & 90 degree

Answer 1

Let the triangle is a b c.
<abc=80'<cab=90' and<bca=70'
in a right angled triangle abc
ac^2 = ab^2 + bc^2
16^2=ab^2+12^2
or ab^2=16^2-12^2
ab^2=256-144
ab^2=112
ab=√112