Look at the isosceles triangle below:
The perimeter of the triangle is 50.
What is the value of X?
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Look at the isosceles triangle below:
The perimeter of the triangle is 50.
What is the value of X?
Since we know the triangle is isosceles, the other side will also be equal to X
Now we can replace the data to calculate X.
The perimeter of the triangle is equal to:
We divide both sides by 2:
22.2
In a right triangle, the side opposite the right angle is called....?
Look for matching labels or markings! In this problem, both sides coming from the top vertex are labeled 'X', while the base is labeled '5.6'. The two sides with the same label are equal.
The problem tells you it's isosceles! This means exactly two sides are equal. If all three were equal, it would be called equilateral instead.
Because there are two sides of length x! Perimeter means adding up all three sides: the two equal sides (x + x) plus the base (5.6).
Yes! You could write it as from the start. This is the same as x + x + 5.6 = 50, just written more compactly.
Always check if your answer creates a valid triangle! The sum of any two sides must be greater than the third side. Here: 22.2 + 22.2 > 5.6 ✓
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