Math

Geometry and Trigonometry

Q: Show answer and explanation

B. 4/5. Use a 3-4-5 triangle: opposite = 3 and hypotenuse = 5, so adjacent = 4. cos A = adjacent ÷ hypotenuse = 4/5. The choice 3/4 is tan A, and 5/3 and 5/4 are the reciprocals of sin A and cos A.

Area and volume; lines, angles and triangles; right triangles and trigonometry; circles.

Not started

Skill/knowledge testing points

Area and volume4 original questions

Lines, angles, and triangles3 original questions

Right triangles and trigonometry3 original questions

Circles3 original questions

Domain drill

13 original questions in this domain (4 easier, 5 mixed, 4 harder).

Sample question

In right triangle ABC, angle C is the right angle and sin A = 3/5. What is cos A?

Show answer and explanation

B. 4/5. Use a 3-4-5 triangle: opposite = 3 and hypotenuse = 5, so adjacent = 4. cos A = adjacent ÷ hypotenuse = 4/5. The choice 3/4 is tan A, and 5/3 and 5/4 are the reciprocals of sin A and cos A.