I need to find the angles of A, B, and C. I already know that b is 90°, but I'm stuck on the others​

Someone me what is the area of this figure? 18m 18m 8m 16m

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

Will mark name all segments skew to bc