Question

DE is an altitude to the side AB in parallelogram ABCD. if DE=AE, find m 12 years ago

Answer 1

got picture?

Answer 2

yahh what ikram002p put

Answer 3

r u getting it ?

Answer 4

http://www.coolmath.com/reference/images/triangle16.gif

Answer 5

I am not understanding it at all

Answer 6

humm ohk ill show it to u again ok ?

Answer 7

this is the sketch

Answer 8

hmm @RachSuarez do you see -> http://www.coolmath.com/reference/images/triangle16.gif

ok.. so you have 2 sides which are equal and one 3rd side that's longer than both

notice the ratios to one another

Answer 9

ohhh.. .ohh wait.. you want angle A... hmmm ok... so scratch that =)

Answer 10

so u know that DE is altitude , that means
it make a right angle with AB right ?

Answer 11

r u getting this ?
@RachSuarez

Answer 12

sides are equal. angles are also equal
sum of angles=90
each angle=45

Answer 13

and u have DE=AE , that makes triangle EDA هsosceles

Answer 14

since its isosceles , that makes angle A=D (in the sketch)

Answer 15

2 legs coming out of whatever angle point, so longs the legs are equal, they will form equal angles on the other end

Answer 16

as you can see from the 45-45-90 rule picture, both legs of "a" are equal to each other, "a" and "a", the longer side is, well, longer :)

Answer 17

thanks for all the help guys! sorry I didn't answer I had to eat dinner and then help m parents!