Question

What type of triangle is formed by joining the points D(7, 3), E(8, 1), and
F(4, -1)?
equilateral triangle
isosceles triangle
right triangle
acute scalene triangle
obtuse scalene triangle

Answer 1

you would draw it ou,t connect the dots, evaluate the lengths then use law of cosines i believe

Answer 2

what?

Answer 3

a^2 = b^2+c^2-2bccosA
(1)
b^2 = a^2+c^2-2accosB
(2)
c^2 = a^2+b^2-2abcosC.

Answer 4

those are the law of cosine

Answer 5

@acxbox22 what you think

Answer 6

http://mathworld.wolfram.com/LawofCosines.html

Answer 7

you use the law of cosines to find the angles

Answer 8

then you use the angles to determine which is what

Answer 9

c

Answer 10

eualaterals have 3 60 degree angles

Answer 11

a?

Answer 12

look at the picture in the link a is side a A is angle A.
ive given you everything you need. if my answer lacks quality. sorry i created an account 5 minutes ago

Answer 13

@dan815 what you think

Answer 14

so what is the answer

Answer 15

no this is how to do it. which gives you a way to do it yourself without spending time on research. which is even better than the answer, buddy

Answer 16

so its b

Answer 17

can somebody correct me