b. 1× =5.12
--
2
c. m + 2 = 7.8
d. 1.2 d = 6
Equilateral Triangle Area = side^2 x .4330127
side^2 = Equilateral Triangle Area / .4330127
side^2 = 4 / 3 cm^2 / .4330127
side^2 = 3.0792014491
side = 1.7547653544
perimeter = 1.7547653544 x 3 =
perimeter = 5.2642960633 cm