Area of Triangles and Trapezoids base altitude base.
13
Area of Triangles and Trapezoids base altitude base base A rea = 1 2 base height
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Transcript of Area of Triangles and Trapezoids base altitude base.
Area of Triangles and Trapezoids
base
altitude
base
base
Area = 1
2base height
Area
Area of Triangles and TrapezoidsFind the area of each triangle.
1.
8.2 ft
1.8 ft5 ft5 ft
2
1 Area 8.2 1.8
4.1 1.8
7.32 ft2 Area
Area of Triangles and Trapezoids
altitude
Base 1
Base 2
2 base 1 base height 2
1 Area
Area of Triangles and Trapezoids
2.
3 in
4 in
4 in
2.5 in 5.5 in
2
1 A 3 2.5 5.5
2
1 A
A = 12 in2
3 8
4 3
2 base 1 base height 2
1 Area
Area of Triangles and Trapezoids
3. 6 yd 3 yd
12 yd
4 yd
2.5 yd
rectangle
A = l wtrapezoid
A 2
16 4
A 24 1.5 5.5
A = 44.25 yd236 8.25
rectangle
3 4 3 4 1.5
12
2
1 A
Pg 512 10 – 2 #1 – 7, 8 – 20 Find the area of each triangle.
1.
10
A = 60 m2
13 m
13 m10 m
12 m
A = 5(12)
hb 2
1 A
12
2
1 A
Pg 512 10 – 2 #1 – 7, 8 – 20 Find the area of each triangle.
2.
13.6
A = 47.6 m2
7 m
13.6 m
12 m 8 m
A = 6.8(7)
hb 2
1 A
7
2
1 A
Pg 512 10 – 2 #1 – 7, 8 – 20 Find the area of each triangle.
3.
9
A = 36 in2
9 in
17 in8 in
10 in
A = 4(9)
hb 2
1 A
8
2
1 A
Pg 512 10 – 2 #1 – 7, 8 – 20 Find the area of each trapezoid.
4.
4
A = 22 cm2
5 cm 4 cm
7 cm
4 cm
A = 2
21 2
1 A bbh
4 7
( 11 )
2
1 A
Pg 512 10 – 2 #1 – 7, 8 – 20 Find the area of each trapezoid.
5.
3
A = 15 in2
3 in
3 in
7 in
A = 5
21 2
1 A bbh
3 7
( 3 )
2
1 A
Pg 512 10 – 2 #1 – 7, 8 – 20 Find the area of each trapezoid.
6.
9
A = 63 ft2
9 ft10 ft4 ft
A = 7
21 2
1 A bbh
4 10
( 9 )
bh A
Pg 512 10 – 2 #1 – 7, 8 – 20 7. A triangle and a parallelogram both have areas of 20
cm2 and bases of 5 cm. What do you know about the heights?
A = 20 cm2
5 cm 5 cm
bh 2
1 A
The height of the triangle is twice that of the parallelogram.
Pg 512 10 – 2 #1 – 7, 8 – 20
