Answer :
![\pink{\sf Third \: side \: of \: the \: triangle = 45}](https://img.qammunity.org/2021/formulas/mathematics/high-school/benqs6x5njw4rhmtxjr8aouwd5pn114a2e.png)
Solution :
As, the given triangle is a right angled triangle,
Hence, We can use the Pythagoras' Theorem,
![\star\:{\boxed{\sf{\pink {H^(2) = B^(2) + P^(2)}}}}](https://img.qammunity.org/2021/formulas/mathematics/high-school/jkn5k9w8htczae2br2dd42pdb8ouw1v822.png)
Here,
- H = Hypotenuse of triangle
- B = Base of triangle
- P = Perpendicular of triangle
In given triangle,
- Base = 24
- Hypotenuse = 51
- Perpendicular = ?
Now, by Pythagoras' theorem,
![\star\:{\boxed{\sf{\pink {H^(2) = B^(2) + P^(2)}}}}](https://img.qammunity.org/2021/formulas/mathematics/high-school/jkn5k9w8htczae2br2dd42pdb8ouw1v822.png)
![\sf : \implies (51)^(2) = (24)^(2) + P^(2)](https://img.qammunity.org/2021/formulas/mathematics/high-school/hgzofytak1mdend4x48el34z8tmh50788k.png)
![\sf : \implies 51 * 51 = 24 * 24 + P^(2)](https://img.qammunity.org/2021/formulas/mathematics/high-school/man3wyfqf726709tqpzipplnf1r6ovd4vv.png)
![\sf : \implies 2601 = 576 + P^(2)](https://img.qammunity.org/2021/formulas/mathematics/high-school/z83r2zntq7gragwv5ubruea5iy5u3jg6lr.png)
![\sf : \implies P^(2) = 2601 - 576](https://img.qammunity.org/2021/formulas/mathematics/high-school/qryh48gkliz0hdol9b1brarcishhlubzip.png)
![\sf : \implies P^(2) = 2025](https://img.qammunity.org/2021/formulas/mathematics/high-school/afgqfeol6mkl89s7o88a5egqpirmrz32mq.png)
By squaring both sides :
![\sf \sqrt{P^(2)} = √(2025)](https://img.qammunity.org/2021/formulas/mathematics/high-school/b887cbrxmyyykxyfwgji8tydz3cl0w2r7x.png)
![\sf : \implies P^(2) = √(2025)](https://img.qammunity.org/2021/formulas/mathematics/high-school/jpx9qolsyt8sgx2k5coddukq0k467jfmi2.png)
![\sf : \implies P^(2) = \sqrt{(45)^(2)}](https://img.qammunity.org/2021/formulas/mathematics/high-school/fzzhrc2pjpbapsbzez8s96fgpb7naheofk.png)
![\sf : \implies P^(2) = 45](https://img.qammunity.org/2021/formulas/mathematics/high-school/g1qwrcjc7luuuqjfn74sjndop9x5te727x.png)
![\pink{\sf \therefore \: Third \: side \: of \: the \: triangle \: is \: 45}](https://img.qammunity.org/2021/formulas/mathematics/high-school/nmfaa38jasnbwow2o34ci8x2dol0lq45xo.png)
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