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.