The digital format by typically includes interactive elements that go beyond standard paper textbooks:
Use the full title "Электронный учебник-справочник Стереометрия 10-11 класс КУДИЦ-ОБРАЗ" to avoid generic geometry results. Kiselev's Geometry / Book II. Stereometry - Amazon.com
This electronic textbook serves as both a primary learning tool and a comprehensive reference guide for high school students studying (solid geometry) .