Answer:
a) 
b) 
c) 5
Step-by-step explanation:
Answer: 41 and 139 degrees
Step-by-step explanation:
We know area of triangle = 
In triangle ABC , AB is the base and BC is the height
Now we find the distance between A and B
Distance formula is 
A(0,3), B(7,3)
Distance AB = 
=
= 7
B(7,3), C(7,7)
Distance BC = 
=
= 4
area of triangle = 
area of triangle = 
=
= 14 
SAS, two sides are congruent and the angles are equal