The seventh grade mathematics unit 4 roll paper (with answers)

Seventh grade mathematics (I) Chapter 4 unit test questions

(Time: 45 minutes; Total score: 100. )

I. Fill in the blanks (4 points for each question, ***40 points)

1. As shown, there are _ _ _ straight lines, _ _ _ rays and _ _ _ line segments.

2. If A, B and C are on the same straight line, and AB=9cm and BC=4cm, then AC = _ _ _ _.

3.23 30'=_____, 13.6 =_____.

At 4.5 o'clock, 15 minutes, the angle between the hour hand and the minute hand is _ _ _.

5. If four straight lines intersect on the plane, the maximum number of intersections is _ _ _ _.

6. Two straight lines intersecting the same straight line intersect _ _ _.

7. The straight line AB intersects the straight line CD at O, if∠AOC = 57 17' 43÷BOC = _ _ _ _.

8. A little beyond a straight line can be regarded as _ _ vertical lines, _ _ parallel lines and _ _ diagonal lines of this straight line.

9. Changing a detour into a straight road can shorten the road because _ _ _ _.

10. If CO⊥AB is in O and any point from OC is perpendicular to AB, then the drawn vertical line will coincide with OC, because _ _ _ _ _ _ _ _ _ _.

Second, multiple-choice questions (4 points for each question, ***20 points)

1. Draw a ray from the vertex of the obtuse angle inside the obtuse angle, and then () will appear in the figure.

A. two acute angles B. 1 obtuse angle C. at least one acute angle D. at least two acute angles.

2. The following statement is true ()

A. extend the straight line AB to c so that BC = AB B. extend the line segment AB to c so that c is the midpoint of ab.

C. extend line AB to c, so that BC = AB d. extend line AB to c, so that BC=AC.

3. The following statement is true ()

A line segments AB and CD on the same plane are parallel if they have no common points.

If they do not intersect, two rays on the same plane are parallel.

If two concentric circles do not intersect, they are parallel lines

D the opposite sides of a square are straight lines with parallel lines.

4. As shown in the figure, the number of angles that can be formed by five rays starting from point O is ()

A.4 B.6 C.8 D. 10

5. If the point B is on the line segment AC, then in the expressions AB= AC, AB=BC, AC=2AB, AB+BC=AC, there is () which can indicate that B is the midpoint of the line segment AC.

1。

Three. Solve problems (question 2 1, 10, question 3 and question 4, question 5 12, * * 40).

1. As shown in the figure, OA⊥OC, OB⊥OD, ∠ COD = 27, ∠AOB=?

2.c is a point on the line segment AB. If m and n are the midpoint of line segments AB and BC, respectively, AC=2MN. Please explain the reason.

Please draw the angles 15,105,75, 135 with a set of triangles.

4. Please draw AE‖CD through point A in quadrilateral ABCD, and pay BC to E. 。

5. Someone walks 200 meters northwest from point O to point P, and then walks 280 meters east from point P to point M. After drawing, measure the distance on the map of om, calculate the actual distance of om, and tell what direction M is in O at this time (1 cm means 100 meters).

Reference answer

1.1.2,10,62.5cm or13cm 3.23.5, 13 36' 4.67.5 5.66. Not necessarily 7. 122 42'.

Second,/kloc-0 1.C2.C3.D4.D5.C

Three. 1.63

2. Solution: Draw a picture according to the meaning of the question.

Because m and n are that midpoint of AB and BC respectively,

So AB=2BM, BC=2BN.

And because AC=AB-BC,

So AC=2BM-2BN=2(BM-BN)=2MN.

3. Prompt: 15 = 45-30 = 60-45, 105 = 60+45,

75 =45 +30 , 135 =90 +45

4. As shown in the figure: