If cos theta = 2/ rad 10 and angle theta is in quadrant 1 what is the exact value of tan 2 theta on simplest radical form

Of four points are collinear, they are also coplanar

Asquare is dilated by a scale factor of 1.25 to create a new square. how does the area of the new square compare with the area of the original square? a)the area of the new square is 1.25 times the area of the original square. b)the area of the new square is 2.50 times the area of the original square. c)the area of the new square is 1.252 times the area of the original square. d)the area of the new square is 1.253 times the area of the original square.

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much