120, 60, 120, 60.
In rectangular coordinate system, A (2) B (2) B (2,3) is known. Try to find a point P on the Y axis, so that the triangle APB is a right triangle, and the P coordinate is _ _ _ _ _ _ _ _.
The four points satisfy the condition: (0,2) (0,3) (0,1) (0,2).
3 linear function y=x+b and x axis, and the focus of y axis is a and b respectively. If the circumference of the triangle OAB is 2+ (root number 2), then b = _ _ _ _ _ _ _ _ _ _ _ _
1
As we all know, rectangular wooden frames are twisted into parallelograms. If the area of this parallelogram is two-thirds (2/3) of the area of the original rectangle, find the smaller degree of the inner angle of the parallelogram.
The base is unchanged, the area is 2/3 of the original, so the height is 2/3 of the original. If the minor internal angle of the parallelogram is a, then sina=2/3, then a=arcsin2/3 is about 49 degrees.
5. A rectangle has D in the upper left corner, A in the lower left corner, C in the upper corner and B in the lower corner. F is on DC (part D) and E is on AB (part B). Fold the rectangle, EF is the crease, so that a and c coincide. (1) Let AC=x and EF=y, and write the functional relationship between X and Y (2) When 45 degrees,