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In a quadrilateral ABCD, angleA+angleD=9...

In a quadrilateral ABCD, `angleA+angleD=90^(@)`. Prove that
`AC^(2)+BD^(2)=AD^(2)+BC^(2)`

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OSWAL PUBLICATION-TRIANGLES-NCERT EXEMPLAR ( EXERCISE - 6.4 )
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  8. A street light bulb is fixed on a pole 6 m above the level of the stre...

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  9. In given figure, ABC is a triangle right angled at B and BDbotAC. If A...

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  10. In given figure PQR is a right angled triangle, right angled at Q and ...

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  11. Ii DeltaPQR, PDbotQR such that D lies on QR, if PQ=a,PR=b,QD=c and DR=...

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  12. In a quadrilateral ABCD, angleA+angleD=90^(@). Prove that AC^(2)+BD^...

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  16. In figure, line segment DF intersects the side AC of a DeltaABC at the...

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  17. Prove that the area of the semicircle drawn on the hypotenuse of a rig...

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  18. Prove that the area of the equilateral triangle drawn on the hypotenu...

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