In triangle ABC,

AB = AC = x; BC = 10 cm and the area of the triangle is 60 cm². Find x.

In △ ABC, ∠C = 90° and AC = BC, then AB² is equal to :

1. AC²

2. 2AC²

3. BC²

4. 2BC² - AC²

In the given diagram, AE² + BD² is equal to :

1. AB² - DE²

2. DE² - AB²

3. AB² + DE²

4. DE × AB