1. Area of
trapezoids
(b1 + b2 )h
A=
2

2. Why?

3. Trapezoids:
Bases: are the two
sides that are parallel
base
height: is measurement
of the line that is
perpendicular (forms a ht
ht
90 angle) to one of the
0
bases. base

4. #1 22
cms
14
(b1 + b2 )h cms 8
A= cms
2 34
cms
( 22 + 34 ) 8 ( 56 ) 8
A= =
2 2
448
A=
2 A = 224 cms 2

5. #2 6.5 km
14
(b1 + b2 )h cms 11 km
A=
2 12.5 km
( 6.5 + 12.5 )11 ( 19 ) 11
A= =
2 2
209
A=
2 A = 104.5 km 2

6. #3 18
cms
8
(b1 + b2 )h cms 6
A= cms
2 30
cms
( 18 + 30 ) 6 ( 48 ) 6
A= =
2 2
288
A=
2 A = 144 cms 2

7. Base lines
#4 Trapezoid Are
Trapezoid #2
#1 Parallel
(b1 + b2 )h
A= 28
2 16 height is
5
Perpendicular
to base
19 11
( 5 + 28 ) 19 ( 28 + 16 ) 11
A= A=
2 2
313.5
( 33 ) 19 ( 44 ) 11
A= +242 A=
2 2
555.5
627 484
A= Add both
A=
2 Areas
2
Together!
A = 313.5 A = 242

8. Base lines
#5 Trapezoid Are
Trapezoid #2
#1 Parallel
(b1 + b2 )h
A= 24
2 13 height is
7 Perpendicular
to base
15 10
( 7 + 24 ) 15 ( 24 + 13 ) 10
A= A=
2 2
232.5
( 31 ) 15 ( 37 ) 10
A= +185 A=
2 417.5 2
465 370
A= Add both
A=
2 Areas
2
Together!
A = 232.5 A = 185