Find the angle at vertex A of the triangle with vertices A(1,0,1), B(-2, 1,3), C (4,2,5). 2 Find the area of the triangle with vertices A (1,4,-1), B(-1,2, 0), C (1,1,3). 3 Find the parametric equation of the line of intersection of the pla x + 2y + x = 1 and x+ 4y + 24 = 1, Find the curvature of the parametric curve at an arbitrary point. *(t) = => 0, , Find the tangential and normal components of accelerate of the parsimetric curve r(+) = at += -1, Bonus Problem: Find on each of the lines a x = 1+2t x=1 y = 1-t and y=1+t Ht Z= t z=24 point such that the two points are the closest possible.