1. In triangle ABC, angle a-angle B = angle c, then this triangle is a right triangle? (judgment) 2. A conical grain bin has a bottom circumference of 6.28 meters and a height of 0.9 meters. If it is installed in a cylindrical grain bin with a bottom radius of 2 meters, how high can it be stacked?

1. Angle a - angle B = angle c and angle a + angle B + angle c = 180, so angle a = 90, so this triangle is a right triangle

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1. It is known that in the triangle ABC, the angles a, B and the opposite sides of angle c are respectively a, B and C, which are the following lengths. Judge whether the triangle is a right triangle
2. In the triangle ABC, a square tanb = b square Tana, judge the shape of the triangle
3. We know that the first-order function y = - 2x + 4 intersects with the x-axis and y-axis, and points a and B (1) make the isosceles triangle ABP with ab as the edge, if P is in the first quadrant (1) Make an isosceles triangle ABP with ab as the edge. If P is in the first quadrant, ask for the coordinates of point P (2) Under the conclusion of 1, make a parallel line of line AB through point P, intersect the x-axis, Y-axis with point C and point d respectively, and calculate the area of quadrilateral ABCD The first question is wrong. It's an isosceles right triangle
4. As shown in the figure, it is known that there are two points a (- 2,0), B (4,0) in the plane rectangular coordinate system, the point P in the first-order function y = 2 / 1 x + 2 / 5, and △ ABP is a right triangle Find the coordinates of point P
5. The first-order function y = x + 3 and X, Y axis intersect at two points a and B respectively, and there is a point P on the coordinate axis, so that the triangle ABP is a right triangle, and the coordinates of point P are obtained
6. If we know that the image of a linear function y = 2x + A, y = - x + B passes through a (- 2,0) and intersects with y axis at two points B and C respectively, then the area of △ ABC is () A. 4B. 5C. 6D. 7
7. If we know that the images of the linear functions y = 3 / 2x + m and y = 1 / 2x + n pass through point a (2,0) and intersect with y axis at two points B and C respectively, then the area of △ ABC is
8. The first-order function y = 3 / 2x + 3 and y = - 1 / 2x + Q both pass through a (m, 0) and intersect with y axis at points B and C 1 respectively. Try to find the area of △ ABC. 2. Point D is a plane The linear functions y = 3 / 2x + 3 and y = - 1 / 2x + Q pass through a (m, 0) and intersect with y axis at points B and C respectively 1. Try to find the area of △ ABC 2. Point D is a point in the plane rectangular coordinate system, and the quadrilateral with points a, B, C and D as the vertex is a parallelogram. Please write the coordinates of point d directly 3. Can we draw a straight line through the vertex of △ ABC, so that it can divide the area of △ ABC equally? If we can, we can find the functional relationship of the straight line; if not, we can explain the reason
9. For example, the image of the first-order function y = - 2 / 3x + 2 intersects with the x-axis and y-axis at point AB respectively. With the line AB as the edge, the isosceles triangle ABC is made in the first quadrant, ∠ BAC = 90 ° For example, if there is a point P on the intersection D of AC and y-axis, OA, and the intersection ab of the vertical line of x-axis, AC is at two points m and N, if Mn = 1 / 3bd, the P coordinate is?
10. It is known that the abscissa of point a (- 2,0), B (4,0) P on the image of function y = 1 / 2x + 2 is m. when the triangle PAB is a right triangle, the value of M is obtained When p is a right angle
11. According to the conditions, judge whether the angle ABC is an acute triangle, a right triangle or an obtuse triangle. (1) angle a = 76 degrees, angle B = 89 degrees. (2) angle a-angle B = angle C (3) Angle a = 20 degrees, angle B = 3, angle c
12. In the plane rectangular coordinate system, s △ ABC = 48 ∠ ABC = 45 ° BC = 16, calculate the coordinates of each vertex of △ ABC A is on the positive half axis of Y axis B is on the negative half axis of X axis C is on the positive half axis of X axis
13. Given that the area of triangle ABC is 5, a (1,2), B (4,6), find the trajectory coordinates of vertex C
14. What is the coordinate of ABC area 12 and C on Y-axis of a (- 5,0) B (3,0) triangle Point a (- 5,0) point B (3,0) triangle ABC area 12, What is the coordinate of C on the Y axis How many are there at point C Coordinate characteristics of point C
15. Given that point a (- 5,0) B (3,0) point C is on the Y axis, and the area of triangle ABC is 12, the coordinate of point C is?
16. As shown in the figure, in the plane rectangular coordinate system, given the area of points a (- 5,0), B (3,0), △ ABC is 12, try to determine the coordinate characteristics of point C
17. Given a (- 5,0), B (3,0) and C on the y-axis, the area of the triangle ABC is 12, the coordinates of C can be obtained
18. As shown in the figure, in the plane rectangular coordinate system, given the area of points a (- 5,0), B (3,0), △ ABC is 12, try to determine the coordinate characteristics of point C
19. If the midpoint of AC is on the x-axis and the midpoint of BC is on the y-axis, then the coordinate of C is () A. （2，-7）B. （-7，2）C. （-3，-5）D. （-5，-3）
20. Given two vertices a (- 3,7), B (2,5) of triangle ABC, the midpoint of tangent AC is on the x-axis, and the midpoint of BC is on the y-axis, then the coordinate of vertex C is?