1, the lengths of the two bottom sides of the right-angled trapezoid are 2 and 5, and the height is 4. The surface area of the obtained geometry is

2. The equation of a straight line with chord length of 8 that passes through point p (3 3,6) and is cut by a circle is.

3. Given that M and L are straight lines and planes, the following propositions are given:

(1) If l is perpendicular to two intersecting straight lines, then;

② If L is parallel to, then L is parallel to all straight lines;

3 if;

4 if;

⑤If∨l .

The serial number of the correct proposition is (note: fill in the serial number of all the propositions you think are correct).

4. If the equation represents a circle, the range of real numbers is

5. In △ABC, A and B are opposite sides of Angle A and Angle B, respectively. A =, B = 1, and b is 30, then the value of angle a is _ _ _ _ _.