30 ° 60 ° s S2S2 S√3 2 A= s 2 √3 4

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

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

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

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

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

S=6 A= 6(9√3 ) A= 54√3 9√3

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

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

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

22.5 ° S=7 A = ½bh A = (4)9.66 A = (38.64) = A =

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

A = ½bh A = (4.5)12.4 A = (55.8) = A =

= 36 ° 36/2 = 18 ° 18 5 Tan 18 = 5/h h = 5/Tan 18 h = S=10

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