3. DESIRED RESULTS I Can remember how to correctly solve a mathematical formula of a triangle by finding its area.

4. FINDING THE AREA HHow do we find the area of a rectangle?  base x height = area HHow do you think we can find the area of a triangle?

5. TYPES OF TRIANGLES

6. WHAT DO YOU KNOW?  What is the formula for finding the area of a triangle?  ½ x base x height  How we can measure the height of a triangle that is not at a 90 o angle?  Draw a straight line from the highest point to the base.

7. CHECK YOUR WORK  How can we find the base of a triangle?  By measuring the bottom of the triangle  How can we find the height of a triangle?  By measuring the 90 o angle from base to top.  How did your group calculate the formula?  ½ x base x height

8. LETS SEE YOU DO IT

9. STEP-BY-STEP  What is the first step to finding the area of a triangle  Find the base  What is the second step?  Find the height  What is the third step?  ½ x base x height

11. What is the area of My Triangle? My base is 4 inches My height is 8 inches a)48in 248in 2 b)12in 212in 2 c)32in 232in 2 d)4in 24in 2

12. What is the area of My Triangle? My base is 6 inches My height is 12 inches What is the area of My Triangle? My base is 6 inches My height is 12 inches a)72in 272in 2 b)18in 218in 2 c)6in 26in 2 d)24in 224in 2

13. What is the area of My Triangle? My base is 5.3 inches My height is 4 inches What is the area of My Triangle? My base is 5.3 inches My height is 4 inches a)9.3in 29.3in 2 b)20.3in 220.3in 2 c)4.3in 24.3in 2 d)21.2in 221.2in 2

14. What is the area of My Triangle? My base is 3.5 inches My height is 15 inches What is the area of My Triangle? My base is 3.5 inches My height is 15 inches a)25.5in 225.5in 2 b)18.5in 218.5in 2 c)52.5in 252.5in 2 d)15.5in 215.5in 2

15. What is the area of My Triangle? My base is 8.2 inches My height is 3.5 inches What is the area of My Triangle? My base is 8.2 inches My height is 3.5 inches a)8.7in 28.7in 2 b)28.7in 228.7in 2 c)15.5in 215.5in 2 d)11.7in 211.7in 2

16. B x H = A 4in x 8in = 32in 2

17. B x H = A 6in x 12in = 72in 2 B x H = A 6in x 12in = 72in 2

18. B x H = A 5.3in x 4in = 21.2in 2 B x H = A 5.3in x 4in = 21.2in 2

19. B x H = A 3.5in x 15in = 52.2in 2 B x H = A 3.5in x 15in = 52.2in 2

20. B x H = A 8.2in x 3.5in = 28.7in 2 B x H = A 8.2in x 3.5in = 28.7in 2

21. THINK CRITICALLY Are there other ways you could write and use the formula?

22. APPLYING YOUR KNOWLEDGE What items around our classroom or home make a triangle that could be measured and calculated to find the area?

23. DIRECTIONAL SIGNS

24. BUILDINGS

25. ON THE PLAY GROUND

27. RANDOM WRONG ANSWER