Question
In a quadrilateral ABCD, $\angle\text{A}+\angle\text{D}=90^\circ.$ Prove that $AC^2 + BD^2 = AD^2 + BC^2.$
[Hint: Produce AB and DC to meet at E]
[Hint: Produce AB and DC to meet at E]

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|
Class interval
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0-8
|
8-16 | 16-24 | 24-32 | 32-40 |
|
Frequency
|
5 | 6 | 4 | 3 | 2 |
| Production yield | 40-45 | 45-50 | 50-55 | 55-60 | 60-65 | 65-70 |
| No. of farms | 4 | 6 | 16 | 20 | 30 | 24 |