Unit 4 Trigonometry and Geometric Modeling Post Test Review

In this triangle, sin A = _________. Round to nearest hundredth..two decimal places.

Answer explanation

This is an isosceles right triangle.

Sin = opposite/hypotenuse

In this triangle, cos A = _________. Round to nearest hundredth..two decimal places.

Answer explanation

cos = adj/hyp

In this triangle, tan A = _________.

Answer explanation

tan = opp/adj

Answer explanation

sin = opp/hyp

sin A = BC/AB

sin B = AC/AB

AC = BC

so sin A = sin B

sin A/sin B = 1

• 0.5

• 0.45

• 1

• 2

AB || DE. DE =  $\frac{1}{3}AB$  .  If the sin A = 0.8, then what is  sin E?

• 0.3

• 0.8

• 1

• 2

Rectangle ABCD is cut by diagonal AC. What is the cos x?

• 3/5

• 4/5

• 3/4

• 4/3

Answer explanation

cos = adj/hyp

Rectangle ABCD is cut by diagonal AC. What is the sin x?

• 3/5

• 4/5

• 3/4

• 4/3

Answer explanation

sin = opp/hyp

Rectangle ABCD is cut by diagonal AC. What is the tan x?

• 3/5

• 4/5

• 3/4

• 4/3

Answer explanation

tan = opp/adj

Rectangle ABCD is cut by diagonal AC. What is the measure of angle x?

Answer explanation

Use an inverse trig ratio.