When the two sides of a triangle are 8 cm and 4 cm long, the length of the third side may be () cm A. 3B. 4C. 7
8-4 < the third side < 8 + 4, so 4 < the third side < 12, that is, the third side is between 4cm and 12cm (excluding 4cm and 12cm)
RELATED INFORMATIONS
- 1. Try to discuss the position relation between the straight line X-my + 2 = 0 and the circle X & sup2; + Y & sup2; = 1 according to the value of M A differential geometry problem, there must be a problem-solving process
- 2. When x is equal to - 1, the value of the third power of the polynomial ax + bx-3 is 2; when x = 1, what is the value of the polynomial?
- 3. Solving inequality | x + 3 | + | 2x-1 | ≥ 7
- 4. 5x-20%x=19.2 3/5:6=(x+3/5):10 5x-4.5*2=0.5 1/8:1/4=1/10:x How about these,
- 5. How is the mathematical calculation done in this step? The value of 2 / 4 of (2Y's square + 3Y + 7) is 1 / 4 { 2Y & { 178; + 3Y + 7 = 8 The value of 2 / 2 of (2Y + 3Y + 7) is one fourth ∴2y²+3y+7=8 Why is it equal to eight?
- 6. Solving equation 1 / 3x + 1 / 2x ≡ 1 / 12
- 7. (x ^ 2 + 2XY + y ^ 2) + (- 2x + 2Y) + 1 factorization factor No, that's right. That's what it says on the paper
- 8. The function image is used to solve x, and the written calculation test is: (1) 5x-3 = x + 2; (2) 0.5x-4 = 3x + 2
- 9. For a two digit number, the new two digit number is 47 times of the original number after exchanging the number of its ten digits with the number of its individual digits. What is the original two digit number? How many double digits are there?
- 10. How to solve the equation of 1.5x = 2.25
- 11. As shown in the figure, in the known trapezoidal ABCD, ad ‖ BC, BC = 3aD, e is a point on the waist AB, connecting CE, (1) if CE ⊥ AB, ab = CD, be = 3aE, find the degree of ∠ B; (2) let the area of △ BCE and quadrilateral AECD be S1 and S2 respectively, and 2S1 = 3s2, try to find the value of beae
- 12. [emergency help] ask for the answer in two hours: in the triangular prism abc-a1b1c1, the side edge Aa1 is vertical to the bottom ABC.AB Vertical BC, D is the midpoint of AC, A1A = a [emergency help] ask for the answer in two hours: in the triangular prism abc-a1b1c1, the side edge Aa1 is vertical to the bottom ABC.AB Vertical BC, D is the midpoint of AC, A1A = AB = 2, BC = 3. Find (1) proof: Ab1 parallel BC1D (2) find the volume of pyramid b-aa1c1d9
- 13. The line segment connected to the corresponding point of an axisymmetric figure is divided into symmetry axis (), corresponding line segment (), corresponding angle ()
- 14. An equilateral triangle is an axisymmetric figure. It has () axes of symmetry
- 15. Is an equilateral triangle an axisymmetric figure? How many axes does it have? What line segments are they
- 16. A quadrilateral is a centrosymmetric figure and an axisymmetric figure_____________ .
- 17. The two quadrangles of an axisymmetric figure are also centrosymmetric figures
- 18. The quadrilateral is not only an axisymmetric figure, but also a centrosymmetric figure______ .
- 19. If a quadrilateral is a centrosymmetric figure, then the quadrilateral is a centrosymmetric figure_____ Quadrilateral, based on______________
- 20. Prove: if a quadrilateral is a centrosymmetric figure, and the intersection of its two diagonals is the center of symmetry, then it is a parallelogram (hint: prove that the diagonals of the two quadrilaterals are equally divided)