I have done (a)(b)(c) but fail to do (d). The book's answer of (d) is 67.2 degree.
Three points A, B and C on horizontal ground are such that AB = 10m, BC = 21m and
. The point P lies on BC and
degree. Calculate
(a) the length of AC
(b) the length of AP
A vertical pole VA of height 19m is placed at A. Calculate, to the nearest tenth of a degree, the acute angle between
(c) VB and the horizontal
(d) the plane VBC and the horizontal
Here's my working of (d) but my answer is wrong.
let VB = a , VC = b
consider triangle VBC,
let VX be the height of triangle VBC and VX perpendicular to BC,
angle between VBC and the horizontal =
degree (wrong)
Thanks in advance!