Two legs of a right-angled triangle are equal to 4 and 12. Find its area.

The area of a triangle is calculated as follows: (base of the triangle * height of the triangle) / 2.
In a right triangle, one leg is always the base, and the other is the height.
So, to find the area, you need to multiply two legs and divide their product by two:
1). 4 * 12 = 48;
2). 48: 2 = 24;
Answer: The area of a right-angled triangle is 24.