Question

In a quadrilateral abcd angle b equal to 90 degree

Answer 1

Step-by-step explanation:

ABCD quadrilateral,angle abc=90°

hence ab²+bc²=ac²--------(1)

ad²=(Ab²+bc²)+cd²-------given

=ac²+cd²------------(2)

In a teiangle acd ,ad has to be a hypotenuse and angle acd must be 90°as per Pythagoras theorem

hope my answer is the brainliest