C^2 = A^2 + B^2
C^2 = 15^2 + 20^2
C^2 = 225 + 400
C^2 = 625
C = √(625)
C = 25
A because 30 times 29 is 870 and they give a card to everyone except themselves
Answer:
⚪ 4: three right triangles and one acute-angled triangle.
Step-by-step explanation:

Answer:
The answer is 13
Step-by-step explanation:
ABC is equal to GHI, so AB = GH which is 13