The sides of a triangle is a, b, and c. Are the three angles all less than 90 measure degrees?
1). The areas of the semi-circles with the radius a, b, c are 4, 5, 6, respectively.
Pls explain your answers
I'm also getting A.
1) By reversing the area calculation, you now know the lengths of a,b,c.
It doesn't matter what the lengths are, but with this data the size of all the angles can be calculated using sine/cosine functions (which I forgot how to use
). Anyway, regardless of what the size of the angles are, the data in (1) is sufficient to find the angles.
2) Insufficient. A large range of sizes could fit into that with varying answers.
c=200 a=180 b=21 (all angles less than 90 ... i tihnk
c=0.3 a=0.4 b=0.5 (right-angled triangle)