15 + 38 = 53
180 - 54 = 127
Answer:
B. Obtuse triangle
Step-by-step explanation:
The following triangle is an obtuse triangle.
<span>The dot product here is 10(9) + 6(5)=120
so the vectors are not orthogonal
</span><span>u.v = |u| x |v| cos (theta) ; theta is the angle between them
we know from above that u.v = 120
|u| = sqrt[10^2+6^2]=11.66
|v| = sqrt[9^2+5^2]=10.29
so we know:
theta =cos^-1 120/(11.66x10.29)
so theta = 25 degrees</span><span>
</span>
Answer:
97.34
Step-by-step explanation:
C = 3.14xd
97.34 = 3.14(31)
