Question: What is the length of the altitude from the vertex opposite the base of 10 cm in an isosceles triangle with equal sides of 13 cm?

Options:

1. 12 cm
2. 10 cm
3. 9 cm
4. 8 cm

Correct Answer: 8 cm

Solution:

Using Pythagorean theorem: altitude = √(13² - (10/2)²) = √(169 - 25) = √144 = 12 cm.