surface area   2 videos

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  Using Sine to Calculate the Area of a Triangle

  Trigonometry Basic Trigonometry

  How to calculate the area of any triangle using two sides and an included angle.

  area of a triangle sine
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  Pythagorean Theorem Proofs

  Trigonometry Pythagorean Theorem

  How to prove the Pythagorean Theorem using Algebra to show the area of the smaller square plus the area of four triangles is equal to the area of the larger square.

  right triangle area of a square binomial squared area of a triangle side leg hypotenuse