Suppose a triangle has sides a, b, and c, and that a2 + b2 < c>. Let e be the
measure of the angle opposite the side of length c. Which of the following must
be true? Check all that apply.
A. a2 + b2 - 2 = 2abcose
B. Cose > 0
C. cose<0
D. The triangle is not a right triangle.

What is the remainder when 2872 is divided by 76? a) 51 b) 57 c) 60 d) 63

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2