jlink6836
24.01.2020 •
Mathematics
Abcd равнобедренная трапеция . диагональ ac является биссектрисой угла a. докажите , что ab=bc=cd
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Ответ:
Step-by-step explanation:
x + x + 65 °+ 25° = 180° ( being sum of angles of triangle )
2x + 90° = 180°
2x = 90°
x = 45
now
<A = 45°
< B = x + 65° = 45 °+ 65 °= 110°
< C = 25°
Hope it helps :)