Which of the following are not necessary when proving that the diagonals of
a rectangle are congruent? check all that apply.
a. opposite sides are perpendicular.
o
b. all obtuse angles are congruent.
o
c. all right angles are congruent.
o
d. opposite sides are congruent.

it 2

step-by-step explanation:

8^1/3=2

8/k

step-by-step explanation:

( - 4 , -7 )

all the lines must parallel  

step-by-step explanation:

coordinates of c = ( - 1 , 2 )

3 units left = ( -4 , 2 )

9 units down = ( - 4 , 11 )

no because mercury has a density of 13.6 grams per centimeter squared while gold has 19.32 grams centimeter squared

step-by-step explanation: