What is the length of sr?

9 units
12 units
15 units
18 units

The correct option is third, i.e.,15 units.

Explanation:

Given: Triangle QRS and STR are right angle triangles. RQ=20 and TQ=16.

Since angle SRT and angle RTQ are on a straight line, then these are complementary angle and the sum of these angles are 180 degree, therefore angle RTQ is 90 degree and the triangle RTQ isa right angle triangle.

Pythagoras formula,

Using pythagoras in triangle RTQ, we get

Let length of SR be x.

Using pythagora in triangle STR we get,

Using pythagora in triangle QRS we get,

Therefore the length of SR is 15 units and third option is correct.

15

Step-by-step explanation:

3rd option on ed 2020