Question

AC and BD are perpendicular bisectors of each other, m 7 years ago

Answer 1

https://us-static.z-dn.net/files/db8/07fb3861a133c8bc87918a95d87c86a0.jpg

Answer 2

@dude

Answer 3

@Hero

Answer 4

@Vocaloid

Answer 5

sum of all angles in a quadrilateral is 360
all the four triangles are equal via hypotenuse leg theorem (they're all right triangles with the same hypotenuse and leg, indicated by the angle marking and the side markings)

so <DAE, <EAB, <DEC and <BEC are equal

that means you can take 360 - <ADC - <ABC, and divide by 4 to find that missing angle

Answer 6

@Vocaloid 75?

Answer 7

check your calculations again

<ADC and <ABC are both 60, right?

so (360-60-60)/4

Answer 8

@Vocaloid 60?

Answer 9

good