What type of triangle has side lengths 12, 13, and 2√3

  obtuse

Step-by-step explanation:

The largest angle is about 99°, so the triangle is obtuse.

__

If the side lengths given are a, b, and c, respectively, then angle B can be found from the Law of Cosines.

  b² = a² +c² -2ac·cos(B)

  cos(B) = (a² +c² -b²)/(2ac) = (12² +12 -13²)/(48√3) = -13/(48√3)

Note that this is negative, so we know the angle is more than 90° meaning the triangle is obtuse.

  B = arccos(-13/(48√3)) ≈ 98.996°

for the points

step-by-step explanation:

which expression can be used to convert 80 us dollars (usd) to australian dollars (aud)?

1 usd = 1.0343 aud

1 aud = 0.9668 usd

step-by-step explanation:

sorry just need the points