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МатематикаВопрос:
All right-angled triangles are:
Ответ:
Ответ:
1. Подобны
Обоснование:
Это утверждение неверно. Прамоугольные треугольники могут быть самыми разными. Например, треугольник с углами 90°, 45°, 45° и треугольник с углами 90°, 30°, 60° не подобны, хотя оба являются прямоугольными.
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- Every equilateral triangle is:
- Every equilateral triangle is:
- All equilateral triangles are:
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- The cosine of an acute angle of a right-angled triangle is equal to the ratio of the length of the adjacent leg to the length of the hypotenuse.
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- The sum of the angles of an acute-angled triangle is 180°.
- The sum of the angles of an obtuse-angled triangle is 180°.
- A triangle with angles 30°, 75°, 75° is:
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- Any bisector of an equilateral triangle is its median.
- The median of an isosceles triangle, drawn from the vertex angle to the base, bisects this angle.
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- Any isosceles triangle has an axis of symmetry.
- Any isosceles triangle has a center of symmetry.
- Any equilateral triangle has a center of symmetry.
- Any equilateral triangle has three axes of symmetry.
- If one of the angles of a triangle is right, then the triangle is right-angled.
- If the hypotenuse and an acute angle of one right-angled triangle are respectively equal to the hypotenuse and an acute angle of another right-angled triangle, then these triangles are equal.
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