☰ Contents · Geometry

Congruence of right triangles. Problems

Lessons 41–42 · 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 △ABC, ∠A = 70°, ∠B = 50°; bisectors from A and B meet at D. Find ∠ADB (degrees).
2
One angle of an isosceles triangle is 70°. What is the smallest possible angle in the triangle (degrees)?
3
Right triangles with hypotenuse 17 and leg 8: are they equal? Which criterion?
4
Write the four criteria for right triangles.
5
Find each angle of an equilateral triangle (degrees).