1, C 2, without figure 3, C 4, ③, ④ 5, 86 < >
6. No Figure 7, ②, ④ 8,90' 5400 "; 7.5 ′ 0. 125 ; 35 1 1'54''
9,80 or 40 10,151,map12,55 or 80.
13,25 degrees, 150 degrees, 100 degrees 14, line, face, body, point, line, face, semicircle, line, cylinder, cone 15, triangle, parallel.
17, curve 6, 8 7, 2 9, symmetry, translation, rotation, symmetry, translation.
10、3
From left to right, there are five problems in the main architectural drawing: sphere, cone, cylinder, triangular prism and quadrangular prism.
Question 8, (1) Fox (2) Pigeon (3) Rabbit (4) Camel or Red-crowned Crane, I don't know ~ ~ ~
1, if ∠ 1 and ∠2 are complementary, ∠ 1 and ∠3 are complementary, and the sum of ∠2 and ∠3 equals the rounded corner (is there something missing, such as a third? ), then these three angles ∠ 1, ∠2 ∠3 are (c) inaccurate, so they should be.
a、50、30、 130 B、70、20、 1 10
75， 15， 105 D，60，30， 120
2. As shown in the figure, B, O and D are on the same straight line, so the degree of ∠2 is (). Is it okay?
a、75 B、 15 C、 105 D、 165
3, the following statement is correct (C)
(1) if you cross a straight line or a little outside the straight line, you can and can only draw a vertical line of this straight line; correct
② The verticality of a straight line can be drawn by passing through point A on the straight line L and point B outside the straight line L; correct
(3) The vertical section of this straight line starting from a point outside the straight line is called the distance from that point to this straight line; correct
(4) Draw a vertical line of a straight line at a point outside the straight line, and the length of the vertical line is called the distance from the point to the straight line. Wrong.
a、 1 B、2 C、3 D、4
4. The following four phenomena in daily life and production: ① battens can be fixed on the wall with two nails; (2) When planting trees, as long as the positions of two trees are determined, the straight line of a row of trees can be determined; (3) When installing wires from A to B, always try to install them along the AB line; ④ Straightening a curved highway can shorten the distance, and the phenomenon that can be explained by "the shortest line segment between two points" is _ _ _ _ _ _ _ _ _ _ _ _ (fill in the serial number).
5. As shown in the figure, bd⊥ac ab⊥bc, vertical foot is D, BC=6 cm, AB=8 cm, AC= 10 cm.
Then the distance from point A to BC is 8, and the distance from point C to AB is 6; AB is less than AC,
AC is greater than BC (fill in ">" or "
6. As shown in the figure, Xiao Ming rotates a triangle containing 600 (the last 0 is a bar) counterclockwise around the vertex A of 600 (the last 0 is a bar) to the position of DAE. If ∠CAE= 1000 has been measured (the last 0 is a bar), ∠ DAB = 0. No pictures.
7. As shown in the figure, OD⊥BC and D are vertical feet, connecting OB. In the following statements: ① line segment OB is the distance between O and B; ② The length of line segment OB is the distance between O and B; ③ The line segment OD is the distance from the O point to the straight line BC; ④ The length of line segment OD is the distance from point O to line BC;
The correct serial number is ② ④;
8. Calculation: ①1.5 = 90 ′ = 5400 ″; ②450〃= 7、5 ′= 0、 125 ; ③90 - 54 48′6〃= .35 1 1'54''
9. Given a ray OA, if two rays OB and OC are drawn from point O, so that ∠ AOB = 60 and ∠ BOC = 20, then ∠ AOC = _ _ 80 or 40 _ _.
10, a person starts from a place, 60 east to the north? Go some distance in the direction of B, then start from B and go south by west? The distance from the direction to C is ∠ ABC = _ _ _ _15 _ _ _ _ degrees.
1 1, as shown in the figure, points A, O and B are on the same straight line, ∠ 1 = 35, ∠ 2 = 55, then the positional relationship between OC and OD is. No pictures.
12, it is known that ∠AOB = 50 and ∠AOC = 1 10 are the bisectors of ∠AOB and ∠AOC, respectively. ∠ the size of the om. It's _ _ _ _
13, from 4: 00 to 4: 40, the hour hand of the clock turned 25 degrees 0 and the minute hand turned 150 degrees 0; At 4: 40, the angle between the hour hand and the minute hand is 100 degree 0;
14 As we know, points move into _ lines _ _, lines move into _ _ surfaces _ _, and surfaces move into _ _ bodies _ _; Any geometric body can be regarded as a figure composed of points, lines and surfaces. Therefore, the sphere can be regarded as a _ _ semicircle _ _ rotating around _ _ line _ _; The rectangle rotates once around one side to get _ _ _ cylinder _ _; A right triangle rotates around one of its right-angled sides to get a _ _ _ _ _ cone.
15, the sides of the pyramid are all _ _ _ _ _ _ _ _. The parallel sides of the prism are equal, the upper and lower bottom surfaces are congruent polygons, and the side surfaces are rectangular.
16, a pyramid * * * has seven faces. This is a five-sided pyramid with five sides.
17, the intersection line between the cylinder and the bottom is _ _ _ _ _ (straight line/curve).
6. The number of cubes coated with three different colors on the surface of the Rubik's Cube is _ _ _ _ _ _.
7. If the number of faces of a cube is F, the number of edges is E, and the number of vertices is V, then F+V-E = _ _ _ 2 _ _
9. The graphic changes you have learned are _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. Paper-cutting art uses _ _ _ _ _ _ symmetry, and skiing uses _ _ _ _ translation.
10. Divide a square into two identical parts with origami. You have three ways.