138
В. 700.
С. 70.
D. 4900.
Task 7. The number of books.
There are 94 books
On two shelves . When 5 books were put on the second shelf
from the first one, the number of the books was the same.
Question.
How many books were there on each shelf originally?
Answer
:____.
Task 8. Setting the angle bisector.
Build and angle bisectors.
Question 1:
Is it true that the resulting angle is greater than a given angle?
Answer:
______.
Question 2
. Is it true that the resulting angle is less than the given angle?
Answer:
______.
Question 3.
Is it true that the resulting angle is twice more than that angle?
Answer: ______.
Question 4
. Is it true that the resulting angle is 2 times less than that angle ?
Answer
: _____.
Task 9. The corners of the triangle.
In the triangle ABC The apex angle is 48 °, adjacent to the angle C is an angle of
102 °.
Question 1.
What is the value of the angle ACB?
Answer: ______.
Question 2.
What is the magnitude of the angle BAC?
Answer: ______.
Question 3.
What is the value of the external angle at vertex A?
Answer: ______.
Question 4:
What is the value of the external angle at vertex B?
Answer
: _____.
Task 10. An isosceles triangle.
In an equilateral triangle, the value of the sum of the exterior angles at the base
318.
Question 1.
Can there be an internal angle of the triangle apex obtuse?
Answer: ______.
Question 2.
Find the angles of the triangle.
Answer: _____.
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