☰ Contents · Geometry

Isosceles triangle and the ASA criterion

Lessons 23–24 · 2 lessons · Geometry Grade 7, corrected and expanded 3rd edition. Yangiyo‘l Poligraf Servis, Tashkent, 2017 (approved by the Ministry of Public Education)
Answers are for parents and teachers.
1
In isosceles △ABC (AB = BC), ∠A = 73°. Find ∠C (degrees).
2
The altitude to the base 34 cm of an isosceles triangle cuts it into equal parts. Each part (cm)?
3
In △ABC and △DEF, AB = DE = 6, ∠A = ∠D, ∠B = ∠E, BC = 9. Find EF.
4
Write the proof that base angles of an isosceles triangle are equal.
5
Isosceles triangle with legs 13 and base 10. Find P.