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When the diameter of ⊙ o is 10cm, the chord AB / / CD, and ab = 8cm, CD = cm, the distance between the chord AB and CD is
There are two
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- 1. P is a certain point on the fixed length line ab. it is known that ab = 30cm. C and d start from P and B and move to the left along the line AB at the speed of 1cm / s and 2cm / s respectively (C is on the line AP and D is on the line BP). 1. In the process of movement, there is always PD = 2Ac. Please explain the position of P on the line ab
- 2. As shown in the figure, D is the midpoint of CB, AC is 1:6 than CB, and DB is 12cm
- 3. As shown in the figure, D is the midpoint of CB, AC: CB = 1:6, DB = 12cm, find the length of AD |_____ |______ |______ | A C D B
- 4. As shown in the figure, the common part of AB and CD is BD, and BD: ab: CD = 1:3:5, EF is the midpoint of AD and CB respectively, EF = 12cm, find the length of AB and CD
- 5. As shown in the figure, the quadrilateral ABCD is a parallelogram, DB ⊥ ad, ad = 8cm, BD = 12cm, find the length of BC and AC Please think for yourself, I can't upload the picture
- 6. As shown in the figure, two points B and C divide the line ad into three parts: 2:3:4. E is the midpoint of the line ad, CD = 12cm, and find the length of CE
- 7. It is known that there are two points c and D on the line AB, and AC: CD: DB = 2:3:4 EF = 2.4cm, e and F are the midpoint of AC and DB respectively, and the length of AB is calculated
- 8. M and N are the two points on the line EF. It is known that EA: ab: BF = 1:2:3, m and N are the midpoint of EA and BF respectively, and Mn = 8cm Write out the problem-solving process of geometry
- 9. A. B is the two points on the line EF. It is known that EA: ab: BF = 1:2:3, m and N are the midpoint of EA and BF respectively, and Mn = 8cm
- 10. As shown in the figure, C and D are two points on the line ab. given that AC: CD: DB = 1:2:3, m and N are the midpoint of AC and DB respectively, and ab = 18cm, the length of the line Mn is calculated
- 11. As shown in the figure, point AB is on the straight line Mn, ab = 13, circle a, radius of circle B is 1, circle a moves from left to right along the straight line Mn at the speed of 3 per second, in the process of circle a's movement, its radius is 1 At the same time, circle B moves along the straight line Mn from right to left at the speed of 1 per second, and its radius remains the same. (1) try to write the functional relationship between the distance d between points AB and time T. (2) how long does circle a and circle B move and how many times are two circles tangent
- 12. As shown in the figure: points a and B are on the straight line Mn, ab = 11 cm, circle a, and the radius of circle B is 1 cm. Circle a moves from left to right at the speed of 2 cm per second. At the same time, the radius of circle B is also increasing. The relationship between radius R (CM) and time t (s) is r = 1 + T (t ≥ 0
- 13. As shown in the figure, points a and B are on the straight line Mn, ab = 11cm, the radii of ⊙ A and ⊙ B are 1cm, and ⊙ a moves at a speed of 2cm per second As shown in the figure, points a and B are on the straight line Mn, ab = 11cm, and the radii of ⊙ A and ⊙ B are all 1cm. ⊙ a moves from left to right at the speed of 2cm per second. At the same time, the radius of ⊙ B is also increasing. The relationship between the radius R (CM) and time t (s) is r = 1 + T (t ≥ 0) (1) Try to write out the functional expression between the distance D (CM) between points a and B and the time t (s); (2) How many seconds after point a starts, the two circles are tangent?
- 14. As shown in the figure, point AB is on the straight line Mn, ab = 11cm, and the radius of circle a and circle B is 1cm
- 15. Points a and B are on the straight line Mn, ab = 11 cm, circle a moves from left to right at the speed of 2 cm per second, and at the same time, the radius of circle B increases, its radius is r cm, and the relationship between the radius and time t is r = 1 + T (T > 0) Wen: how many seconds after point a starts, the two elements are tangent The radius of circle a and B is 1 cm
- 16. It is known that: as shown in Figure 1, M is a certain point on the fixed length line AB, C and D respectively start from m and B and move to the left along the straight line BA at the speed of 1cm / s and 3cm / s, and the direction of motion is shown by the arrow (C is on the line am, D is on the line BM) (1) If AB = 10cm, when points c and d move for 2S, find the value of AC + MD. (2) if points c and d move, there is always MD = 3aC, fill in the blank directly: am=______ Ab. (3) under the condition of (2), where n is a point on the line AB and an-bn = Mn, the value of mnab is obtained
- 17. As shown in the figure, P is the point on the fixed length line AB, and C and D respectively start from P and B and move to the left along the line AB at the speed of 1cm and 2cm per second. C is on the line AP D is on line BP (1) What is the quantitative relationship between the length of BD and PC? Explain the reason (2) If C and d move to any time, there will always be PD = 2Ac, please explain the position of point P on line AB! Figure: a -------- C --- P -------- D -------- B 20: 30, plus points!
- 18. As shown in the figure, P is the point on the fixed length line AB, C and d start from P and B respectively and move to the left along the straight line AB at the speed of 1cm / s and 2cm / s, C is on the line AP, (C is on the line AP, D is on the line BP) when C and d move to any time, there is always PD = 2Ac, then AP / AB equals () a.1/2 b.1/3 c.1/4 d.1/5. (2) under the condition of (1), q is a point on the line AB, and aq-bq = PQ, find the value of PQ / ab
- 19. As shown in the figure, P is the point on the fixed length line AB, and C and d start from P and B respectively along the straight line AB at the speed of 1cm / s and 2cm / s
- 20. As shown in the figure, P is the point on the fixed length line AB, and C and D respectively start from P and B and move to the left along the straight line AB at the speed of 1cm / s and 2cm / S (C is on the line AP) As shown in the figure, P is the point on the fixed length line AB, and C and D respectively start from P and B and move to the left along the line AB at the speed of 1cm / s and 2cm / S (C is on the line AP and D is on the line BP) (3) Under the condition of (1), if CD = 1 / 2Ab happens to exist after C and d move for 5 seconds, then point C stops moving and point d continues to move (point D is on line Pb), and m and N are the midpoint of CD and PD respectively. This paper attempts to explore the quantitative relationship between line Mn and AB, and gives a conclusion and reasons