Question Bank / Math / Right Triangles and Trigonometry

Right triangles and trigonometry SAT question

Math · Geometry and Trigonometry · Hard · Answer it here, explanation included.

The figure presents right triangle R S T such that side R T is horizontal, vertex T is to the right of vertex R, and vertex S is above R T. Side R S is labeled 12. Side S T is labeled 5. Angle S is a right angle

In triangle RST above, point W (not shown) lies on $line segment R T$ . What is the value of $cosine of angle R S W, minus sine of angle W S T$ ?

Enter a number or fraction (like 3/17 or 0.176). Press Enter to check.

ExplanationShow

The correct answer is 0. Note that no matter where point W is on $side R T$ , the sum of the measures of $angle R S W$ and $angle W S T$ is equal to the measure of $angle R S T$ , which is $90 degrees$ . Thus, $angle R S W$ and $angle W S T$ are complementary angles. Since the cosine of an angle is equal to the sine of its complementary angle, $the cosine of angle R S W, equals, the sine of angle W S T$ . Therefore, $the cosine of angle R S W, minus, the sine of angle W S T, equals 0$ .

Drill this skill on Aceit

Adaptive practice, a daily plan, and score tracking take a free account so we can save your work.

Practice this skill

Right triangles and trigonometry SAT question

More Right triangles and trigonometry questions