Question

Angles A and C are equal to 90 degrees.
Which proportion is true?
AOB = COD
AOC = DDC
ABO = CDO
AOC = DOB

Answer 1

is there any figure related to the question ? :P some part is missing

Answer 2

what do you mean by AO/AB etc.. ie. the / sign
its been a while since ive dealt with this

Answer 3

Their the angles i believe

Answer 4

remember that opposite angles are equal*

Answer 5

opposite angles can be seen with the dot

Answer 6

hence the third side of each triangle must be the same if there are two equal angles in each traingle

Answer 7

So is it C
because the triangles are similar