Question 1133873
if sin A=6÷13 and SecB=13÷6 then A+B is equal to
150°
90°
60°
45°
<pre>{{{matrix(1,7, sin (A), "=", 6/13, "=", O/H, "=", y/r)}}}
{{{matrix(1,7, sec (B), "=", 13/6, "=", H/A, "=", r/x)}}}
As seen, x = y = 6, and so, this is an ISOSCELES right triangle. 
This means that &#8737s A and B are 45<sup>o</sup> each, and 2(45<sup>o</sup>) = {{{highlight_green(90^o)}}}
NO NEED to CALCULATE ANYTHING!!