1. Area of Triangles and Trapezoids
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2. Warm Up Find the area and perimeter. 76.5 in 1). 2). 30 in ½ cm
76.5 in
1).
2). 30 in
½ cm
3). Find the perimeter.
4). Find the area.
2x +2
X + 3 7 5
4x +14
7x+21

3. Flippable

4. Area of Triangles
To find the area of a triangle you multiply the base and the height and divide by 2.
In a right triangle the height and base are the right angle. h h b b

5. Find the area of each triangle.
Practice
Find the area of each triangle.
1).
2). 8
yds.
3.4 in
6 yds.
4.6 in
3).
4).
15 cm
8.9 in
24 cm
10 in

6. Area of Trapezoid
To find the area of a trapezoid you add both of the bases and multiply by the height of the trapezoid. Then divide by 2. h

7. Find the area of each trapezoid.
Practice
Find the area of each trapezoid.
14 in
3 cm
1).
2).
4 cm
7 in
21 in
5 cm
21 yd.
3).
10 yd.
34 yd.

8. Closure
Compare how to find area of a triangle to the area of a trapezoid. How are the methods alike? Different?