Let triangle ABC be right-angled and angle B a straight line.
Then AB and BC are legs.
By the condition of the problem AB = 30 mm and BC = 100 mm.
The area of a right-angled triangle is equal to half the product of the legs:
S = 1/2 * AB * BC = 1/2 * 30 * 100 = 1500.
Answer: the area of the triangle is 1500 sq. Mm.
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