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Geometry: Areas of Triangles

Chapter 9.1 C. Geometry: Areas of Triangles. What is a triangle?. Triangles are pretty much just parallelograms cut in HALF. Area of a triangle. There are 2 formulas for triangles A = ½ b x h A = b x h. H E I G H T. 2. BASE. H E I G H T.

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Geometry: Areas of Triangles

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  1. Chapter 9.1 C Geometry: Areas of Triangles

  2. What is a triangle? Triangles are pretty much just parallelograms cut in HALF

  3. Area of a triangle There are 2 formulas for triangles A = ½ b x h A = b x h H E I G H T 2 BASE H E I G H T On some triangles the height IS part of the shape!!! BASE

  4. Just follow the formula and you’ll be fine! 7 in. 6 in. 8 in. 4.2 in ALWAYS write the formula, then plug in the numbers! A = ½ b x h A = ½ 4.2 x 7 A = ½ b x h A = ½ 8 x 6 A = 14.7 in2 A = 24 in2 Area is always labeled in “square” measures

  5. Working backwards A = 36 ft2 h 12 ft. Since we know the AREA already, work the problem backwards to find the height! A = ½ (b x h) 36 = ½ (12 x h) 36 x 2 72 = 12 x h 72 / 12 6 = h

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