Question : The perimeter of an isosceles triangle is 100 cm. If the base is 36 cm, find its semi-perimeter (in centimetres).
Option 1: 64 cm
Option 2: 60 cm
Option 3: 45 cm
Option 4: 50 cm
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Correct Answer: 50 cm
Solution :
Semi-perimeter of a triangle $= (\frac{\text{Perimeter}}{2})$
= $\frac{100}{2}$
= 50 cm
Hence, the correct answer is 50 cm.
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