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5 Written questions

5 Multiple choice questions

  1. trigonometric ratio: abbreviation cos; the cosine of an acute angle in a right triangle equals the side adjacent to the angle divided by the hypotenuse (cos A = adj/hyp)
  2. The angle formed when looking up from the horizontal
  3. The angle formed when looking down from the horizontal
  4. In a triangle with shorter sides a and b and longer side c, if a^2 + b^2 < c^2, then the triangle is obtuse
  5. Ratios formed by the sides of a right triangle. Useful in finding the missing sides of a right triangle given an angle and a side. Trigonometric ratios include sine (sin), cosine (cos), and tangent (tan). Other ratios (not covered in this chapter) are: cosecant, secant, and cotangent

5 True/False questions

  1. Acute triangleIn a triangle with shorter sides a and b and longer side c, if a^2 + b^2 < c^2, then the triangle is obtuse

          

  2. Pythagorean TripleIn a right triangle with legs a and b and hypotenuse c, a^2 + b^2 = c^2

          

  3. 45-45-90 right triangleSpecial right triangle: isosceles right triangle where the legs are congruent and the hypotenuse = leg * sqrt(2)

          

  4. 30-60-90 right triangleSpecial right triangle: isosceles right triangle where the legs are congruent and the hypotenuse = leg * sqrt(2)

          

  5. Inverse Trig RatioGives us the measure of the angle whose sin/cos/tan is a given ratio value. "Undoes" sin, cos, or tan. Written using a "-1" (looks like an exponent, but isn't). Also called "arc," such as arcsin, arccos, arctan. Example: arcsin(1/2) = 30 degrees. Useful in finding missing angle values in right triangles.