Hey please can anyone help me here, quickly the diagonals of the quadrilateral ABCD bisect each other perpendicularly at O.
prove that AB² + CD² = AD²+ BC²
no diagrams for the question.
i will give brainliest

In triangle ABD, we know, by pythagorean theorem

AD^2+BD^2=AB^2 - (I)

In triangle CBD, by pythagoreans theorem

CD^2+BD^2=BC^2 - (II)

Subtracting equation (I) and (II)

AD^2+BD^2-CD^2-BD^2=AB^2-BC^2

AD^2-CD^2=AB^2-BC^2

AD^2+BC^2=AB^2+CD^2

AB^2+CD^2=AD^2+BC^2

En triángulo ABD , lo sabemos, por Pitágoras teorema

ad² + bd² = ab²

the answer is the third / last answer

step-by-step explanation:

the most boring ever written

step-by-step explanation:

i am writing something. yes, i plan to make it the most boring thing ever written. i go to the store. a car is parked. many cars are parked or moving. some are blue. some are tan. they have windows. in the store, there are items for sale. these include such things as soap, detergent, magazines, and lettuce. you can enhance your life with these products. soap can be used for bathing, be it in a bathtub or in a shower. apply the soap to your body and rinse. detergent is used to wash clothes. place your dirty clothes into a washing machine and add some detergent as directed on the box. select the appropriate settings on your washing machine and you should be ready to begin. magazines are stapled reading material made with glossy paper, and they cover a wide variety of topics, ranging from news and politics to business and stock market information. some magazines are concerned with more recreational topics, like sports card collecting or different kinds of hairstyles. lettuce is a vegetable.