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МатематикаВопрос:
2) One angle of a right-angled triangle is 45°. Find the other acute angle.
Ответ:
Решение:
В прямоугольном треугольнике один угол всегда равен 90°. Сумма углов треугольника равна 180°. Чтобы найти неизвестный острый угол, нужно из 180° вычесть сумму двух известных углов.
- Найдем сумму известных углов: 90° + 45° = 135°.
- Вычтем эту сумму из 180°: 180° - 135° = 45°.
Ответ: 45°
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- 6) In triangle ABC, AB = BC. Angle CAD is marked with two arcs, and angle BAC is marked with one arc, suggesting they are equal. Angle C is 50°. Find the angle marked with a question mark.
- 7) In the figure ABCD, AB is parallel to CD, and AD is parallel to BC. The angle at vertex A is 137°, and the angle at vertex D is 0. This is likely a typo for a quadrilateral ABCD, where AB is parallel to CD and AD is parallel to BC, which makes it a parallelogram. In a parallelogram, opposite angles are equal and consecutive angles sum to 180°. If angle A is 137°, then angle C is also 137°. Angles B and D would be 180° - 137° = 43°. The notation '0' for angle D is incorrect. Assuming it's a parallelogram with ∠A = 137°.
