Сформулировать первый признак равенства треугольников с доказательством и чертежом

По горизонтали:

1. У какой фигуры все углы прямые? В ответ запишите название фигуры в именительном падеже. 

2. У параллелограмма противоположные стороны попарно ... 

3. Площадь какой фигуры можно найти по формуле S = ah,
где a – длина основания, h – высота, проведённая к основанию?  

4. Диагонали ромба пересекаются и взаимно ...

5. Выпуклый четырёхугольник, у которого две стороны параллельны. 

По вертикали:

6. Параллелограмм является прямоугольником, если его диагонали ... 

7. Чтобы найти площадь трапеции, нужно полусумму её оснований умножить на ... . В ответ запишите слово в именительном падеже. 

8. Чтобы найти площадь этой фигуры, нужно её сторону возвести в квадрат. Как называется эта фигура?

9. Отрезок, соединяющий противоположные вершины четырёхугольника.  

10. Луч, исходящий из вершины угла и делящий угол на два равных угла.


ответы:  

По горизонтали:
1 – прямоугольник; 2 – параллельны; 3 – параллелограмм;
4 – перпендикулярны; 5 – трапеция;

По вертикали:
6 – равны; 7 – высота; 8 – квадрат; 9 – диагональ; 10 – биссектриса; 

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