How to measure quadrilateral area in Geometer's Sketchpad? How to select the interior of quadrilateral?

Select the inside of the quadrilateral and measure it again

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1. As shown in the figure, in square ABCD, e is the point on DC, connect be, make CF ⊥ be at P, intersect ad at F, if AP = ab
2. The maximum value of quadratic function y = - x ^ 2-4x + 3 and the equation of symmetry axis are
3. There are 324 squares on a go board, each with a piece If the result of the game is: Black accounts for half of the total, white accounts for a quarter of the total. Then who wins the game?
4. How to prove that a graph is centrosymmetric, congruent or other?
5. If we know that the sum of the two right sides of a right triangle is equal to 8 and what are the two right sides, what is the maximum area of the right triangle?
6. What is the probability that the distance between P and each surface area of the cube is greater than 3 / a if we randomly take a point P in the cube ABCD ABCD with edge length a
7. The lower part of a trapezoid is three times the upper part. The upper part is extended by eight centimeters to form a parallelogram with an area of 288 square centimeters. The area of the original trapezoid is calculated
8. If △ ABC ∽ a'b'c ', BC; b'c' = 2; 3, the sum of their circumferences is 15 and the difference of their areas is 20, find the respective circumferences and areas of the two triangles
9. Arrange 3 ^ - 55,4 ^ - 44,5 ^ - 33 from small to large
10. A plan of rectangular foundation is drawn on a 1 / 2000 scale drawing. How many square meters is the actual floor area of this foundation? Please write a formula
11. Let f (x) be any function defined on (- A, a). It is proved that G (x) = f (x) + F (- x) is an even function, H (x) = f (x) - f (- x) is an odd function, and X belongs to (- A, a) Please; ah
12. The quadratic function f (x) satisfies f (2 + x) = f (2-x), f (2) = 1, f (0) = 3. If f (x) has a minimum value of 1 and a maximum value of 3 on [0, M], then the value range of M is
13. Physical conversion: 1.5.2m = --- m 2.9.8m = DM = --- cm 3.207mm = --- M = --- DM 4.3.8km = --- M
14. 0025m=()dm=()cm=()mm
15. In the international system of units (SI), the basic unit of length is:______ The symbol is:______ In addition, some other units are specified: kilometer (km), decimeter (DM), centimeter (CM), millimeter (mm), micron (μ m), nanometer (nm), etc
16. In the international system of units, the unit of length is___ , the symbol is__ What is the time unit___ The symbol is___ 50 nm___ m
17. 1、10³km=______ mm=_____ Micron 2, 180dm=_____ m=_______ nm 3、2,7x10³nm_____ km=____ dm 4、485m=______ mm=______ km
18. (1)75μm= = m (2)15cm= = km (3)240dm= = km (4)0.36mm= = nm
19. 76x10, KM = M = DM = um = nm
20. 0.05m=( )cm,5mm=( )m,0.7μm=（）nm,100cm=( )μm,30nm=( )km,2km=( )mm The answers should be expressed by scientific counting