Given the dimensions of the shape, the length of PR can be found to be 19.8 units.
How to find the length of PR?
The given triangle is an equilateral triangle which means that all the sides are equal.
That then means that:
PR = QR
So we can solve as:
2n + 9 = 7n - 18
Solving for n gives:
7n - 2n = 18 + 9
5n = 27
n = 5.4
The length of PR is therefore:
= 2n + 9
= 2 (5.4) + 9
= 19.8 units
Find out more on equilateral triangles at https://brainly.com/question/2351368
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