Answer is
A. First prove ABC is congruent to CDA, and then state AD and BC are corresponding sides of the triangles.
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This is overdetermined. Without looking at the ratio (except for the order of the sides) the actute angles in a right triangle are complementary so the answer must be:
Answer: A=35°, C=90°, B=55°
We can do it the way they like.
7+18+11 =36
so to get 180 degrees we need to scale the ratio elements by a factor of 5.
7:18:11=35:90:55
A is the smallest. We see C is indeed a right angle and B is complementary to A.
The solution for this task is: 13+5=18 18*2=36
Thinking about combining 45 pennies and 50 pennies. How many pennies would you have in total? 95