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What's on the worksheet
- Use Heron's formula to find the area of each triangle from its three sides.Sides 10, 10 and 12Sides 7, 8 and 9Sides 4, 13 and 15Sides 6, 7 and 9
- Both triangles below have an odd perimeter, so s is not a whole number.
- A climbing gym bolts triangular plywood panels to a wall to make overhangs.
- Three triangles each have perimeter 36:
- A triangle has sides that are three consecutive whole numbers, n - 1, n and n + 1, with n > 2.
- Mei applies Heron's formula to the lengths 4, 9 and 14.
- A tile maker cuts a triangular tile with edges of 17 centimeters, 25 centimeters and 28 centimeters.
Teach it first
The free lesson teaches it with worked examples and practice problems.
Heron's formula: the lesson ›More Chapter 7 worksheets: Laws of sines and cosines
- 7.1Law of sines
- 7.2The ambiguous case
- 7.3Law of cosines
- 7.4Area from two sides and the included angle
- 7.5Heron's formula
- 7.6Applications of oblique triangles
- 7.7Bearings and navigation