Find the area of each equilateral triangle.

The triangle has 12cm sides.

The triangle has 10in altitudes.

Use the Pythagorean Theorem to find the height / bases in each triangle. Then apply formula for area - b(h)/2

To find the area of an equilateral triangle, you can use different formulas depending on the given information.

1) If you know the length of the sides:
The formula to calculate the area of an equilateral triangle when you know the length of its sides (s) is:
Area = (sqrt(3) / 4) * s^2

For the equilateral triangle with 12cm sides:
Area = (sqrt(3) / 4) * 12^2
= (sqrt(3) / 4) * 144
≈ 62.35 cm^2 (rounded to two decimal places)

2) If you know the height (altitude) of the equilateral triangle:
The formula to calculate the area of an equilateral triangle when you know the height (h) is:
Area = (h * s) / 2

For the equilateral triangle with 10in altitudes:
Since only the altitude length is given, we need additional information to determine the length of the sides. Without knowing the length of the sides, we cannot calculate the area of the equilateral triangle with just the altitude length.

Please provide the length of the sides of the equilateral triangle, or any other information if available, to proceed with the calculation.