Cho tam giác ABC có AB=AC. gọi là E trung điểm BC a) chứng minh AE là phân giác góc A
b) chứng minh AE vuông góc với BC
c) vẽ EQ vuông góc với AB tại Q
vẽ EK vuông góc với AC tại K
d) chứng minh BQ=CK
e) chứng minh AQ=AK
f) chứng minh AE vuông góc QK
g) chứng minh QK// BC

Someone me! if you’re smart you can solve this!

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?

In the diagram, be and ad pass throughthe center of circle o, and the area ofsector aoc is 47.45 square units. what isthe area of sector boc? use the value =3.14, and round your answer to two decimalplaces.22.33 square units25.12 square units