# Grid-Ins

## Student-Produced Response

If *XYZ* above is equilateral, what is the value of *r* + *s* + *t* + *u* ?

Correct Answer: 300

**Explanation:**

Since *XYZ* is equilateral, *r* = *u* = 60. The sum of *s* + *t* equals 180 since the two angles form a straight line. Therefore, *r* + *s* + *t* + *u* = 60 + 60 + 180 = 300.

(from the October 14, 1997 test)