Tangents, Sine and Cosine with Right Triangles

A tangent line intersecting with a radius always creates a ____________ angle

• right

• acute

• obtuse

• straight

Find the radius r

• 2

• 3

• 4

• 5

Assume that the lines that appear to be tangent are tangent. O is the center of the circle. Find the value of x to the nearest tenth.

• 11.7

• 10.8

• 13.0

• 14.2

Assume that lines that appear to be tangent are tangent. O is the center of the circle. What is the value of x? (HINT: Remember tangent lines and circles create right triangles)

Find the value of x to the nearest tenth. (Hint: Draw a right triangle)

• 10.8

• 10

• 6.5

• 9.2

What is the side across from the right angle called?

• Leg

• Pythagoras

• Hypotenuse

• Altitude

Which side is the short leg of this 30-60-90 triangle?

• 6

• m

• n

What type of triangle is the context of our study of trigonometry?

• right triangle

• isosceles triangle

• scalene triangle

• acute triangle

What is the correct ratio set up for finding the tangent of Angle A? Remember: Tangent = opposite/adjacent

• 20/12

• 12/20

• 12/16

• 16/12

cos B = ? Remember: Cosine ratio is adjacent/hypotenuse

• 12/13

• 12/5

• 5/13

• 5/12