As shown in the figure, in the plane rectangular coordinate system xoy, given the points a (- 1,5), B (- 1,0), C (- 4,3) (1), we can calculate the area of ABC

（1）S△ABC=1/2 ×5×3= 7.5

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1. As shown in the figure, in the plane rectangular coordinate system, a (- 1,5), B (- 1,0), C (- 4,3); (1) calculate the area of △ ABC; (2) draw the figure △ a1b1c1 after △ ABC is translated one unit down and five units to the right, and write the coordinates of each vertex
2. In the plane rectangular coordinate system, point a (0,3), point B (0,2), and point C are on the x-axis. If the area of △ ABC is 15, find the area of point C Find the coordinates of point C
3. Point a (0, - 3) point (- 3,0), point C on the x-axis, if the area of triangle ABC is 15, find the coordinates of point C
4. In the plane rectangular coordinate system, the circumscribed circle of a (- 2,0), B (2,0), C (1, √ 3) triangle ABC is m, and the equation for finding the circle m is given To process... Online, etc Ellipse x2 / 4 + x2 / 2 = 1, the right focus is F. if P is any point on the circle m which is different from AB and passes through the origin, make the vertical intersection line of PF x = 2, and judge the positional relationship between PQ and circle m by Q
5. It is known that in RT △ ABC, ∠ a = 90 °, AB > AC, P is a point on AB, ∠ ACP = ∠ B, AC = 6, Pb = 5, find the sine value of ∠ APC. Draw the figure yourself. Please, everyone!
6. RT △ ABC, in which the angle a is 90 ° and BC is 4, there is an internal angle of 60 ° and the point P is different from the point AB on the straight line AB, and ∠ ACP = 30 °, then the length of Pb is longer
7. In RT △ ABC, ∠ a = 90 °, BC = 4, there is an internal angle of 60 ° and point P is a point on the straight line AB which is different from a and B, and ∠ ACB = 30 °, then the length of Pb is? 3 / 4 root 3 / 8 root 3 / 4, there are three answers, but I can't do it,
8. In the RT triangle ABC, the angle a is equal to 90 degrees and BC is equal to 4. There is a point P with an internal angle of 60 degrees, which is different from a and B on the straight line AB, and the angle ACP is equal to 30 degrees to find the length of Pb
9. As shown in the figure, in RT △ ABC, ∠ ACB = 90 ° AB = 6, P is the point on AB, connect PC, set ∠ BCP = m ∠ ACP, when AP = 3 / 2, whether there is a positive integer m, Make PC perpendicular to ab? If it exists, calculate the value of M. if it does not exist, explain the reason
10. As shown in the figure, it is known that △ ABC, P is the point on AB, connecting CP. in the following conditions, △ ACP ∽ ABC cannot be determined as () A. ∠ACP=∠BB. ∠APC=∠ACBC. ACAP＝ABACD. ACAB＝CPBC
11. A (0,0), B (- 3, - 4) C (4, - 2), draw these points (done) in the plane rectangular coordinate system, find the area of △ ABC, the first question has been done
12. (1) Please draw a plane rectangular coordinate system, and draw a (0,1), B (2,0), C (4,3) these three points, (2) find the area of △ ABC (3) Suppose that point P is on the coordinate axis, and the area of △ ABP and △ ABC is equal, then the coordinate of point P is obtained Mainly the third question,
13. Dawning school has a triangle shaped flower bed ABC, first you can directly measure ∠ a = 30 °, AC = 40m, BC = 25m, please find out the area of this flower bed
14. In the triangle ABC, C = 90 degrees, a = 75 degrees, CD is vertical to AB, and the perpendicular foot is D, what is the value of CD / AB
15. It is known that in the triangle ABC, angle B = 45 degrees, angle c = 75 degrees, AC = 2, find BC
16. In the triangle ABC, if angle a = 75 degrees, angle c = 45 degrees, and ab = 2, then AC=
17. In triangle ABC, angle a is 75 degrees, angle B is 45 degrees, and ab is 2
18. Triangle ABC, ab = 4, angle a = 60, angle B = 75, area
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20. As shown in the figure, in the right triangle ABC, AC &; BC = 24, hypotenuse AB = 8, CD perpendicular to AB and D, find the length of de De is the center line on the hypotenuse ab