2. 30 ° 60 ° s S2S2 S√3 2 A= s 2 √3 4

3. A= s 2 √3 4 S= 3 A= 3 2 √3 4 A= 9√3 4 A≈ 3.9

4. A = s 2 S=4 A = 4 2 A = 16

5. 360 5 = 72 ° 72/2 = 36 ° 36 ° S=5 2.5 Tan 36 = 2.5 / h h = 2.5 / Tan 36 h = 3.44 3.44

6. 36 ° S=5 2.5 3.44 A = ½bh A = (2.5)3.44 A = 8.6 8.6 5(8.6) = 43 A = 43

7. Equilateral Triangle A= 6 2 √3 4 S=6 A= 36√3 4 A= 9√3 9√3

8. S=6 A= 6(9√3 ) A= 54√3 9√3

9. 360 7 = 51.43 ° 51.43/2 = 25.7 ° 25.7 ° 3.5 Tan 25.7 = 3.5/h h = 3.5/Tan 25.7 h = 7.27 7.27 S=7

10. 25.7 ° 3.5 7.27 S=7 A = ½bh A = (3.5)7.27 A = 25.45 25.45 7(25.45) = 178.1 A = 178.1

11. 360 8 = 45 ° 45/2 = 22.5 ° 22.5 ° 4 Tan 22.5 = 4/h h = 4/Tan 22.5 h = 9.66 9.66 S=8

12. 22.5 ° 4 9.66 S=7 A = ½bh A = (4)9.66 A = 38.64 25.45 8(38.64) = 309.1 A = 309.1 38.64

13. 360 9 = 40 ° 40/2 = 20 ° 20 4.5 Tan 20 = 4.5/h h = 4.5/Tan 20 h = 12.4 12.4 S=9

14. A = ½bh A = (4.5)12.4 A = 55.8 9(55.8) = 502.2 A = 502.2 55.8 20 4.5 12.4

15. 360 10 = 36 ° 36/2 = 18 ° 18 5 Tan 18 = 5/h h = 5/Tan 18 h = 15.4 15.4 S=10

16. 18 5 15.4 S=10 A = ½bh A = (5)15.4 A = 77 10(77) = 770 A = 770 77