IKMC 2027 - Grades 5-6 - Self-study SET 8 - Thematic Batch 3 Question 15

An isosceles triangle has perimeter 525 mm. Its base is half as long as either equal side. How long is each equal side, in centimetres?



Source-key correction: the printed key D is incorrect. The exact given measurements yield C,21 cm. The original choices are retained.