1. OBJECTIVES
We will be able to find the area and surface area of parallelograms, trapezoids and rectangular prism by using the formula.

2. FORMULAS 2 SA= 2 (lw+ hw +lh) Area of PARALLELOGRAM A= bh
Area of TRAPEZOID A= (b1 + b2) h 2
Surface Area of a
RECTANGULAR PRISM
SA= 2 (lw+ hw +lh)

3. AREA OF PARALLELOGRAM
The formula for area is A=bh where b is the base and h is the height.
A= bh
A=(17)(12)=204 ft2.

4. Area of Trapezoids

5. Trapezoids b2 h b1
Trapezoids have 2 bases. They are the parallel sides.
The height is determined by forming a right angle from base 1 to base 2.

6. Finding the area of trapezoids
Area = ½ h (b1 + b2) b2
10 cm. h
5 cm.
15 cm. b1
½ 5 ( )
½ 5 ( 25)
2.5 ( 25) =
62.5 cm2

7. Ready to try some?

8. Area = (b1 + b2) (h) 2 Find the area b2 11 ft. 4 ft. h 16 ft. b1
( )/2 (4)
( 27/2) (4)
( 13.5) (4)=
54 ft.2

9. Find the area
20 ft.
8 ft.
28 ft.
½ 8 ( )
½ 8 ( 48)
4 ( 48) =
192 ft.2

10. Area = ½ h (b1 + b2) Find the area 8m. 5 m. 16 m. ½ 16 ( 8 + 5)
½ 16 ( 13)
8 ( 13) =
104 m.2

11. Area = ½ h (b1 + b2) Find the area 4 in. 6in. 9 in. ½ 6 ( 9 + 4)
½ 6 ( 13)
3 ( 13) =
39 in.2

12. Area = ½ h (b1 + b2) Find the area 35m. 24 m. 31 m. ½ 24 ( 31 + 35)
½ 24 ( 66)
12 ( 66) =
792 m.2

13. Area = ½ h (b1 + b2) Find the area 12 cm. 10 cm. 16 cm.
½ 10 ( )
½ 10 (28)
5 ( 28) =
140 cm.2