Solving Triangles Using Sine, Cosine, Tangent

Solve for x. Round to the nearest tenth.

• 103.5

• 4.7

• 55.0

• 23.4

Choose the correct ratio.

• sin^-1(9/20)

• cos^-1(9/20)

• tan^-1(9/20)

• cos^-1(20/9)

A ladder is leaning against a wall. The foot of the ladder is 6.5 feet from the wall. The ladder makes an angle of 74^𝑜 with the level ground. How high on the wall does the ladder reach?

Which of the following is the correct diagram for the problem?

• 
• 
• 
• 

Solve for x using the correct trig ratio.

• 8.5

• 2.9

• 6.2

• 6.9

• 7.7 ft

• 9.2 ft

• 10.1 ft 

Which trig function should we use to solve for the length of the side length opposite of 15 degrees?

• sine (SOH)

• cosine (CAH)

• tangent (TOA)

Which trig function should we use to solve for the angle marked with the theta?

• sine (SOH)

• cosine (CAH)

• tangent (TOA)

Which trig function should we use to solve for x on from your worksheet?

• sine (SOH)

• cosine (CAH)

• tangent (TOA)

How can we solve for the last side?

• Pythagorean Theorem

• Cosine (CAH)

• Either one works!

Which trig function should we use to solve for the angle marked with the theta? (on #6 from your worksheet)

• sine (SOH)

• cosine (CAH)

• tangent (TOA)