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16 bytes added
, 05:29, 14 August 2014
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| ∠PAB+∠PBA+∠APB=180˚<br> | | ∠PAB+∠PBA+∠APB=180˚<br> |
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− | y˚+x˚+(x˚+y˚)=180˚ | + | y˚+x˚+(x˚+y˚)=180˚<br> |
− | 2x˚+2y˚=180˚ | + | 2x˚+2y˚=180˚<br> |
− | 2(x˚+y˚)=180˚ | + | 2(x˚+y˚)=180˚<br> |
− | x˚+y˚=90˚ | + | x˚+y˚=90˚<br> |
| ∴ ∠APB=90˚ | | ∴ ∠APB=90˚ |
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