the triangle is an isosceles triangle with its base passing through the center of the circle. The diameter of the circle is 40 cm. Calculate the area of the shaded region, to the nearest tenth of a cm³​

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.