1/2 of angle D is given as 32 degrees.
The 3 inside angles need to add up to 180 degrees.
Angle B is a right angle, which is 90.
Angle C = 180 - 90 - 32 = 58 degrees.
We can create a formula first.
X will be the unknown number
840= 357+x
-357 -357
483 = x
Hope this helps
