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Holt CA Course 1 10-4 Area of Triangles and Trapezoids.

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Presentation on theme: "Holt CA Course 1 10-4 Area of Triangles and Trapezoids."— Presentation transcript:

1 Holt CA Course Area of Triangles and Trapezoids

2 Holt CA Course Area of Triangles and Trapezoids A. Find the area of the triangle. Example 1: Finding the Area of a Triangle 5 8 The area of the triangle is 20 square units.

3 Holt CA Course Area of Triangles and Trapezoids B. Find the area of the triangle. Example 2: Finding the Area of a Triangle 9 The area of the triangle is 54 square units. 12

4 Holt CA Course Area of Triangles and Trapezoids A. Find the area of the triangle. The area of the triangle is 27 square units. Check It Out! Example 3 6 9

5 Holt CA Course Area of Triangles and Trapezoids B. Find the area of the triangle. The area of the triangle is 35 square units. Check It Out! Example

6 Holt CA Course Area of Triangles and Trapezoids The two parallel sides of a trapezoid are its bases, b 1 and b 2. The height of a trapezoid is the perpendicular distance between the bases. h b1b1 b2b2

7 Holt CA Course Area of Triangles and Trapezoids In the term b 1, the number 1 is called a subscript. It is read as b-one or b sub-one. Reading Math

8 Holt CA Course Area of Triangles and Trapezoids A. Find the area of the trapezoid. Example 5: Finding the Area of a Trapezoid 5 in. 6 in. 9 in. The area of the trapezoid is 42 in 2.

9 Holt CA Course Area of Triangles and Trapezoids B. Find the area of the trapezoid. Example 6: Finding the Area of a Trapezoid The area of the trapezoid is 98 cm cm 16 cm 7 cm

10 Holt CA Course Area of Triangles and Trapezoids A. Find the area of the trapezoid. The area of the trapezoid is 45 in 2. Check It Out! Example 7 4 in. 6 in. 11 in.

11 Holt CA Course Area of Triangles and Trapezoids B. Find the area of the trapezoid. The area of the trapezoid is 94.5 cm 2. Check It Out! Example 8 16 cm 5 cm 9 cm

12 Holt CA Course Area of Triangles and Trapezoids The state of Wisconsin is shaped somewhat like a trapezoid. What is the approximate area of the state? Example 9: Geometry Application The area of Wisconsin is approximately 56,000 square miles.


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