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

hey mate here is yur ans
D(7,3),E(8,1) and F(4,1)
DE= √(x2-x1)^2+(y2-y1)^2. this is formula
=√ (8-7)^2+(1-3)^2
= √(1)^2+(-2)^2
= √ 1+4
=√5
on applying a formula
EF=√(4-8)^2+(-1-1)^2
=√16-4
=√12
ON APPLY AGAIN
DF=√(7-4)^2+(3+2)^2
√9+25
√34
DF ,EF, AND AND DE ARE NOT EQUAL
IT'S A ACUTE SCALENE TRIANGLE
HOPE IT HELP U