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Fill in the blanks in seventh grade mathematics
The vertex of an obtuse angle is perpendicular to both sides. If the angle between two vertical lines is 30, then the obtuse angle is _ _ _ _ _.

Answer. 150

If ∠ 1 and ∠2 are antipodal angles, ∠3 and ∠2 are complementary and ∠ 3 = 60, then ∠1= _ _ _ _.

Answer. 120

On the same plane, straight line a//b, straight line b//c, then the relationship between straight line C and straight line A is _ _ _ _ _.

Answer. a//c

Given that OA⊥OC,∠AOB: ∠AOC=2: 3, ∠BOC is _ _ _ _ _

Answer. 30 or 150.

Two straight lines are parallel, and the difference between the internal angles of a pair of cylinders is 90, so these two angles are _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Answer. 135.45

If point M(a b, a b) is in the second quadrant, then point N(a, b) is in the _ _ quadrant.

Answer 3

In cartesian coordinate system, a point is (-1, 3). If this point moves 3 units to the left and 2 units to the upper, then the coordinates of this point are _ _ _ _.

Answer. (-4,5)

If the sum of three sides of a triangle is 8, 9, 1 1 respectively, then these three sides are _ _ _ _ _.

6.5.3

If the ratio of the three internal angles of a triangle is 2: 3: 4, the degree of the three internal angles of this triangle is 0. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Answer .40,60.80

If two sides of a triangle are equal, and the perimeter is 16cm, and the length of one side is known to be 4 cm, then the lengths of its three sides are _ _ _ _ _ _ _ _ _ _ _ _ _.

Answer .. 4 cm 6 cm 6 cm.