Cho tam giác ABC, vẽ ra phía ngoài ∆ABC các hình vuông ABDE và ACFK. chứng minh rằng:
a) EKvuông góc với trung tuyến AM của ∆ABC và EK = 2AM
b) nếu I là đỉnh thứ tư của hình bình hành EAKI thì I thuộc đường cao AH của ∆ABC
c) CD = BIvà CD ⊥ BI;BF= CI và CF ⊥ CI.
d) CD, BF, AH đồng quy

.24

step-by-step explanation:

the probability is   .24

the first player had the highest probability of getting a silver marble

the game could be made fair by adding back the marble that was drawn after each draw

b: |12 – x| ≤ 0.25

step-by-step explanation:      

let x be the possible lengths in inches, of the ribbons jaime cut.

we have been given that jaime is cutting strips of ribbon for a project. he tries to cut each piece to be 12 inches long, but sometimes he cuts it too long or too short by as much as 0.25 inch.  

we can represent this information in an inequality as:

by the definition of absolute value function we will get,

upon combining our inequalities we will get,

therefore, the inequality   describes all the possible lengths (x), in inches, of the ribbons jaime cut.

step-by-step explanation:

step-by-step explanation: