Answer:
30
Step-by-step explanation:
(Solution: 12/20 + 12/x = 1, x = 30 min)
The Second one 2-10, 4-20, 6-30
Answer:
All triangles are open figures.f (60-60-60)
All triangles have 3 sides that are equal in length.f(3,4,5)
Only some triangles have 1 right angle.t
All triangles are polygons.t
All triangles have 3 angles.t