Look at the following triangle:
The perimeter of the triangle is 17.
What is the value of X?
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Look at the following triangle:
The perimeter of the triangle is 17.
What is the value of X?
We know that the perimeter of a triangle is equal to the sum of all sides together, so we replace the data:
Divide the two sections by 8.5:
2
In a right triangle, the side opposite the right angle is called....?
When you have like terms (all containing x), you add their coefficients! Think of it as = (2 + 3 + 3.5) × x = .
That's totally normal! Just divide both sides: . You can also convert to fractions if you prefer: .
Check the triangle inequality! The sum of any two sides must be greater than the third side. With x = 2: sides are 4, 6, and 7, and 4 + 6 > 7 ✓
Technically you could, but it's much harder! Combining like terms first turns a complex equation into a simple one-step division problem.
Perimeter is the distance around the outside of a shape. For triangles, just add up all three side lengths to get the total distance around!
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