Answer:
Part 1)
![PR=9\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/s3v2o95amx1j3k9622db6g02ux2w5ucy0h.png)
Part 2)
![PQ=12\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/b5jrapmihpgspcgrgwrchlnoya19hdamvm.png)
Part 3)
![PS=15\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/g3ngin2kcydztt7spy9cm8dt93vu6bm9om.png)
part 4)
![QR=15\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/jmq8wqeifh8zc0coxws21c0el30tke85zw.png)
Part 5)
![RT=7.5\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ezrzjkacsgqfxwqgro25zxxq2ooazasf7l.png)
Explanation:
we know that
In a rectangle opposite sides are parallel and congruent
The measure of each interior angle is 90 degrees
The diagonals are congruent and bisect each other
step 1
Find the length of side PR
we know that
----> by opposite sides
we have
![QS=9\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/iv61jwruuhvnkk6hkffcs22xugxehfzgvj.png)
therefore
![PR=9\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/s3v2o95amx1j3k9622db6g02ux2w5ucy0h.png)
step 2
Find the length of side PQ
we know that
----> by opposite sides
we have
![RS=12\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/z88s962ydwzt2y6zaiwdg9tkfmmhfbz8ep.png)
therefore
![PQ=12\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/b5jrapmihpgspcgrgwrchlnoya19hdamvm.png)
step 3
Find the length of diagonal PS
we know that
---> the diagonals bisect each other
we have
---> given problem
therefore
![PS=2(7.5)=15\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/wcurbrxrcuy8r3lvdxt8dkvbw9a56yonio.png)
step 4
Find the length of diagonal QR
we know that
---> the diagonals are congruent
we have
![PS=15\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/g3ngin2kcydztt7spy9cm8dt93vu6bm9om.png)
therefore
![QR=15\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/jmq8wqeifh8zc0coxws21c0el30tke85zw.png)
step 5
Find the length of RT
we know that
---> the diagonals bisect each other
we have
![QR=15\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/jmq8wqeifh8zc0coxws21c0el30tke85zw.png)
substitute
![15=2RT\\RT=7.5\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ifqxe9hifbn0m7biblu52w8guqp4ayad0u.png)