Cosine Rule & Heron's Formula

Find angle Z

• 20.15°

• 71.23°

• 51.06°

• 57.71°

Use Law of Cosines to find angle T

• 62.2°

• 53.1°

• 59.5°

• 64.7°

Find m<C

• A
• B
• C
• D

Find XZ

• 16.004 meters
• 544.165 meters
• 34.7 meters
• 1204.165 meters

Find QR

• 34.7 km
• 2.2 km
• 13.74
• 31.1 km

Find the missing side.

• 15.9 in.

• 22.8 in.

• 19.2 in.

• 521.1 in.

8.Solve for x

• 3.85

• 4.25

• 3.35

• 5.65

Find BC

• A
• B
• C
• D

To approximate the length of a marsh, a surveyor walks 425 meters from point A to point B. Then the surveyor turns 65º and walks 300 meters to point C. Approximate the length AC of the marsh.

• 250

• 615

• :)

• Not me

What is the purpose of Heron's formula?

• To find the angle measure in a triangle.
• To find the area of a non-right triangle.
• To find the side length of a triangle.
• To find the height of a triangle.