The perimeter of a isosceles triangle:
P = 2 a + b
where:
a = length of the two equal sides
b = third (unequal) side
P = 2 a + b = 24
In this case a = x , b = 9 cm.
2 x + 9 = 24
Subtract 9 to both sides
2 x + 9 - 9 = 24 - 9
2 x = 15
Divide both sides by 2
x = 7.5 cm
An isosceles triangle has two equal side of length xcm each and a third side of 9cm. If it's perimeter is 24cm what is the van of x?
2 answers
7.5cm