Law of Cosines and Heron's Formula

What is the length of side x?

• 130 cm

• 112 cm

• 150 cm

• 105 cm

Which Law would you use?

• Law of Sines

• Law of Cosines

• Law of the Jungle

• Law of Gravity

Which Law would you use?

• Law of Sines

• Law of Cosines

• Law of the Jungle

• Law of Gravity

Find the exact area of the triangle

• 13.9 in²

• 13.8 in²

• 14.0 in²

• 27.9 in²

Find QR

• 34.7 km

• 2.2 km

• 13.74

• 31.1 km

Solve for x by using the Law of Cosines

• 3.85

• 4.25

• 3.35

• 5.65

• 10.1
• 10.0
• 10.9
• 8.86

Which Law would you use to solve for Angle B?

• Law of the Jungle

• Law of Cosines

• Law of the Gravity

• Law of Sines

Find BC

• A

• B

• C

• D

What is the distance across the river? The two sides are 4.15 miles and 5.33 miles. The included angle measure is 37 degrees.

• 2.9 miles

• 3.2 miles

• 3.6 miles

• 3.9 miles