- #1
Tommzar
- 12
- 0
Homework Statement
i need to find angle BDC and side BC when given that
AB = 60m
BAC = 64
AC = 124
BD = 130
CD = 145
and to find the area of the whole plot
Homework Equations
The Attempt at a Solution
i have worked out side BC = 111.59 by using the Co-sine rule
a^2 = (60^2 + 124^2) - (2*60*124cos64)
=111.59
and angle BDC = cosC = (145^2) + (130^2) - (111.59^2) = 25472.6719
25472.6719/ (2x 145 x 130)
= 0.675
[PLAIN]http://mathworld.wolfram.com/images/equations/InverseCosine/Inline1.gif0.675[/URL] = 47.49
just need help on finding side AD and other internal angles
Last edited by a moderator: