Find the area of a right-angled triangle with legs 20mm and 55mm.

Given: abc – right triangle;

a, b – legs;

a = 20 mm, b = 55 mm;

Find: Sabc -? mm ^ 2.

The area of a right-angled triangle is found by the formula: = 1/2 a * b.

Thus, the area of a given right-angled triangle is:

Sabc = 1/2 * 20 * 55 = 550 (mm ^ 2).

Answer: The area of the triangle is 550 mm ^ 2.

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