Question

Jika a ( 2,3,4) dan b ( 0,4,-3) . Besar sudut antara a dan b adalah

Answer 1

Verified answer

Cos @ = a.b / |a| . |b|
cos @ = 2.0 + 3.4 + 4(-3) / √2^2+3^2+4^2 . √0^2+4^2+(-3)^2
cos @ = 0+12-12/√4+9+16 .√0+16+9
[email protected] = 0/√29.√25
cos @ = 0
@ = arc cos 0 = 90°