Variant 1 1. The man is 4 m away from the street lamp. Its angle of incidence relative to a street lamp is
60 °. Use the picture below to find the height of the street light.
60
[3]
2. The side of a rhombus is 10 cm, and its diagonal is 12 cm. Find the second diagonal of the
rhombus.
[4]
3. Given ctga Find cosa
[3]
4. The height of the hypotenuse of a right triangle divides the hypotenuse into segments of
length 4 cm and 9 cm. Find the legs of a right triangle.
C
5. In an equilateral trapezoid ABCD, BC is 5 cm, the height CE is 4V3, and the leg makes an
angle of 30° with the base AD. Find the base of the trapezoid AD.
[6]
Через три года на счету
[(1,1x - n) * 1,1 + 100 000] * 1,1 = 1,1³x - n * 1,1² + 100 000 * 1,1 =
= 1,1³x - n * 1,1² +110 000
Сумма 1,1³x больше суммы 1,1³x - n * 1,1² + 110 000 на 4950
1,1³x - 11³ x + n * 1,1² - 110 000 = 4950
n * 1,1² = 114 950
n = 95 000
Пётр снял 95 000 рублей