Definition of Base Angle Theorem. Base Angle Theorem states that if two sides in a triangle are congruent, then the angles opposite to these sides are also congruent. 1  Base angles of an isosceles triangle are equal.
Restores the destroyed forest. The Spring Sprite is the protagonist of The Firebird Suite segment of Fantasia 2000. The Spring Sprite is a benevolent force of life and creation. She loves the forest and its creatures, and is happy to bring spring every year.
For other uses of the word, see Firebird. The Firebird (French: L'Oiseau de feu; Russian: Ð¶Ð°Ñ-Ð¿ÑÐ¸ÑÐ°, Zhar-ptitsa) is a ballet by the Russian composer Igor Stravinsky, written for the 1910 Paris season of Sergei Diaghilev's Ballets Russes, with choreography by Michel Fokine.