1. Surface Area Tutorial

2. Surface Area of Rectangular Prisms
Surface area is the measure of the outside faces on a 3-D figure. Find the area of each and add them up!

3. What are the dimensions of this rectangle?
4 cm 7 cm 10
Do you see the RED face?
What are the dimensions of this rectangle?
4 cm
10 cm

4. Do you see another face that is just like the RED face?
4 cm 7 cm 10
Do you see another face that is just like the RED face?
Where is it located?
Keep an eye on the next screen!

5. Yes, it’s on the back.
10cm
4 cm

6. 40cm2
Now there are 2 rectangles
that each have an area of 40 sq. cm

7. What are the dimensions of this rectangle?
4 cm 7 cm 10
Do you see the BLUE face?
What are the dimensions of this rectangle?
4 cm
7 cm

8. Do you see another face that is just like the BLUE face?
4 cm 7 cm 10
Do you see another face that is just like the BLUE face?
Where is it located?

9. Yes, it’s on the left side.
7 cm
4 cm
4 cm
7 cm

10. 28cm2
Now there are 2 rectangles
that each have an area of 28 sq. cm.

11. Do you see the GREEN face?
4cm 7 cm
10cm
Do you see the GREEN face?
What are the dimensions of this rectangle?
7 cm
10 cm

12. Do you see another face that is just like the GREEN face?
4 cm 7 cm 10
Do you see another face that is just like the GREEN face?
Where is it located?

13. Yes, it’s on the bottom.
10cm
7 cm
10cm
7 cm

14. 70cm2
Now there are 2 rectangles
that each have an area of 70 sq. cm.

15. Now we just need to add all the areas of the sides together.+
70cm2
28cm2
40cm2

16. The total Surface Area for this rectangular prism is=
276cm2

17. Here is another method! 140 + 56 + 80 = 276 sq. cm 4 cm 7 cm 10
Top & Bottom
They are the same so find the area of one of them and multiply by 2.
A = bh or A = lw
A = 10 x 7
A = 70
70 x 2 = 140
Left & Right
They are the same so find the area of on side and multiply by 2.
A = bh or A = lw
A = 4 x 7
A = 28
28 x 2 = 56
Front & Back
They are the same so find the area of one of them and multiply by 2.
A = bh or A = lw
A = 10 x 4
A = 40
40 x 2 = 80
= 276 sq. cm