Holt CA Course 1 10-4 Area of Triangles and Trapezoids.
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Holt CA Course 1 10-4 Area of Triangles and Trapezoids
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Transcript of Holt CA Course 1 10-4 Area of Triangles and Trapezoids.
Holt CA Course 1
10-4 Area of Triangles and Trapezoids
Holt CA Course 1
10-4 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.
Holt CA Course 1
10-4 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.
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Holt CA Course 1
10-4 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
Holt CA Course 1
10-4 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 4
10
7
Holt CA Course 1
10-4 Area of Triangles and Trapezoids
The two parallel sides of a trapezoid are its bases, b1 and b2. The height of a trapezoid is the perpendicular distance between the bases.
h
b1
b2
Holt CA Course 1
10-4 Area of Triangles and Trapezoids
In the term b1, the number 1 is called a subscript. It is read as “b-one” or “b sub-one.”
Reading Math
Holt CA Course 1
10-4 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 in2.
Holt CA Course 1
10-4 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 cm2.
12 cm
16 cm
7 cm
Holt CA Course 1
10-4 Area of Triangles and Trapezoids
A. Find the area of the trapezoid.
The area of the trapezoid is 45 in2.
Check It Out! Example 7
4 in.6 in.
11 in.
Holt CA Course 1
10-4 Area of Triangles and Trapezoids
B. Find the area of the trapezoid.
The area of the trapezoid is 94.5 cm2.
Check It Out! Example 8
16 cm
5 cm
9 cm
Holt CA Course 1
10-4 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.
