Chapter Closure
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Since an equilateral triangle's sides are congruent, we can then set the expressions equal to each other.
Solution: x=7
Perimeter: 75 unts.
An equilateral triangle's sides are all congruent.
Since we have been given expressions for AB and AC we can set them equal to each other and then solve for x.
When we know that x=7, we can substitute this into either expression to calculate the triangle's side. 4( 7)-3=25 As we can see, the triangle has a side of 25 units. Like we already explained, all of its sides are congruent. Therefore, to determine the perimeter, we will multiply this number by 3. 3(25)=75 units