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Perimeter and Area of Quadrilaterals and Triangles 9-1

Perimeter and Area of Quadrilaterals and Triangles 9-1. I can find the perimeter of triangles, parallelograms , rectangles, and trapezoids. I can find the area of triangles, parallelograms, rectangles , and trapezoids.

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Perimeter and Area of Quadrilaterals and Triangles 9-1

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  1. Perimeter and Area of Quadrilaterals and Triangles9-1 I can find the perimeter of triangles, parallelograms, rectangles, and trapezoids. I can find the area of triangles, parallelograms, rectangles, and trapezoids. I can find missing measurements given the area or perimeter.

  2. Review: Special Right Triangles 45° 30° 45° 60° **Answers need to be left as simplified radical. Note: Textbook says to round to the nearest tenth… Do not follow these directions! Leave as simplified radical!!`

  3. Example Find the perimeter of the rectangle, in which A = (79.8x2 – 42) cm2 Step 1 Use the area and the height to find the base. A = bh 79.8x2 – 42 = b(21) 3.8x2 – 2 = b Step 2 Use the base and the height to find the perimeter. P = 2b + 2h P = 2(3.8x2 – 2)+ 2(21) P = (7.6x2 + 38) cm

  4. Example Find the height of a rectangle in which b = 3 in. and A = (6x² + 24x – 6) in2. A = bh 6x2 + 24x – 6 = 3h 3(2x2 + 8x – 2) = 3h 2x2 + 8x – 2 = h h = (2x2 + 8x – 2) in.

  5. 56 56 Example Find the base of the parallelogram in which h = 56 yd and A = 28 yd2. A = bh 28 = b(56) b = 0.5 yd

  6. Example Find the base of the triangle, in which A = (15x2) cm2. 6x = b b = 6x cm

  7. Example Find b2 of the trapezoid, in which A = 231 mm2. 42 = 23 + b2 19 = b2 b2 = 19 mm

  8. Example Find the area of the triangle. Find b. A = 96 m2

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