Sine and Cosine of a Triangle

Find the size of angle X.

• 0.954

• 72.5

• 72.4

• 72.3

Find the length of BD.

Hint: Use SOH-CAH-TOA

• 35.2

• 24

• 75.5

• 51.5

Which of the following formulas is the Cosine rule?

• c² = a² + b² - 4ac + cosA

• c² = a² - b² - 2abcosC

• c² = a² + b² - 2abcosC

• (cos A)/a = (cos B)/b

Find the unknown side length, c.

• 6.52

• 6.38

• 6.91

• 6.67

Find the length of BC using Cosine Rule.

• 626.70

• 25.03

• 313.35

We can use SOH-CAH-TOA for...

• Any triangle ever

• Non-right triangles only

• Right Triangles only

• Never

Find the area of the triangle

• 72.3cm²

• 84.4cm²

• 77.9cm²

• 78cm²

The ratio of the length of the side opposite of the angle to the length of the hypotenuse is the _____________

• Sine

• Cosine

• Tangent

The ratio in a right triangle of adjacent to hypotenuse is _____

• sine

• cosine

• tangent

• hypotenuse

What is the ratio for Sine?

• Hypotenuse/Opposite

• Opposite/Hypotenuse

• Opposite/Adjacent

• Adjacent/Opposite