In a quadrilateral ABCD, ∠B = 90°. If AD² = AB² + BC² + CD², prove that ∠ACD = 90°.
Solution:
More Solutions:
- Prove that BD = BC.
- Find these angles.
- Prove that it is a trapezium.
- Find the angles of the parallelogram.
- Calculate angles CDB and ADB.
- ABCD is a parallelogram with perimeter 40.
- If ∠ABD = 50°, find ∠DPC.
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