Cho tam giác ABC vuông ở A có AB=12 cm, AC=5cm a, tính độ dài BC và góc ABC (độ lớn của góc làm tròn đến phút)
b, kẻ AH vuông góc BC ,tính AH

Lena reflected this figure across the x-axis. she writes the vertices of the image as a'(−2, 8), b'(−5, 6), c'(−8, 8), d'(−4, 2).

In the diagram of circle o, what is the measure of zabc?

Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.