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These rules for triangles are:

A

opposite angles are equal

B

the angles of a triangle are 180 degrees together

C

a straight angle is 180 degrees

D

a triangles always has an obtuse angle

The midpoints of the classes are:

A

3 8 13 mm

B

2 8 12 mm

C

2 7 12 mm

D

2.5 7.5 12.5 mm

Number of tickets is ...

A

42

B

42.5

C

43

D

43.5