Select all expressions that have a sum or difference of 3 /4 . A. 1 /2 + 2/ 4 B. 11/ 12 − 1 /6 C. 3 /5 + 3 /20 D. 7/ 8 − 1 /2 E.
2 answers:
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Answer:
54 cm
Step-by-step explanation:
The area (A) of an equilateral triangle is
A = ( s is the side length ) then
= 81
( multiply both sides by 4 to clear the fraction )
s² = 324
( divide both sides by
)
s² = 324 ( take the square root of both sides )
s = = 18
Thus
perimeter = 3 × 18 = 54 cm