Answer:
t = 17.5 , f = 12
Explanation:
the interior angles of a square are 90° , then
4t + 20 = 90 ( subtract 20 from both sides )
4t + 20 - 20 = 90 - 20 ( simplify )
4t = 70 ( divide both sides by 4 )
t =
, that is
t = 17.5
and
7f + 6 = 90 ( subtract 6 from both sides )
7f + 6 - 6 = 90 - 6 ( simplify )
7f = 84 ( divide both sides by 7 )
f =
, that is
f = 12