Step-by-step explanation: We are given to find the size of SR in the right-angled triangle SRQ as displayed in the figure.

You are watching: What is the length of ? 9 units 12 units 15 units 18 units

Since RT is perpendicular to the hypotenuse SQ, therefore triangle RTQ and SRT are additionally right-angled triangles at edge RTQ and RTS respectively.

Also, RQ = 20 units and TQ = 16 units.

Using Pythagoras organize in triangle RTQ, us have Now, due to the fact that RT is perpendicular to the hypotenuse that ΔRST, so us get Again, utilizing Pythagoras theorem in right-angled triangle RST, we get Thus, the size of SR is 15 units.

Option (C) is CORRECT.

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