Alternate Formula for the Area of a Triangle: Alternate Area of a Triangle

This Alternate Formula for the Area of a Triangle: Alternate Area of a Triangle interactive also includes:

It's always nice to have a plan B. Pupils investigate an alternate formula for the area of a triangle that uses sine. A set of challenge questions shows how the new formula relates to the well-known formula of (1/2)bh.

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Instructional Ideas
  • Use the resource to introduce the formula for the area of a triangle involving sine
Classroom Considerations
  • Users need to set up a free CK-12 account
  • Learners must be aware of the sine ratio
Pros
  • Interactive is easy to use
  • Provides immediate feedback to challenge questions
Cons
  • None