An isosceles triangle has an unequal side as ‘u’ and two equal sides are shown by ‘e’. Express the perimeter of the triangle using ‘u’ and ‘e’.

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Solution

length of the equal sides $= e u n i t$
length of the unequal side $= u u n i t$
perimeter $= (2 \times e q u a l s i d e s + u n e q u a l s i d e) u n i t = (2 \times e + u) u n i t = (2 e + u) u n i t$

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