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uticabadgirl
14.12.2020 •
Mathematics
22) The length of tangents drawn from
an external point to a circle are equal to
4 cm and radius is 3 cm then the
distance of external point from the
centre is
O 2 cm
O 3 cm
O 4 cm
O 5 cm
Solved
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Ответ:
The length from the external point to the center of the circle is 5 cm
Step-by-step explanation:
Here, we want to calculate the distance from the center of the circle to the external point
Please check attachment for diagram
Now, from what we know, the tangent and the radius meets at right angle
So we have a right-angled triangle with the length from the external point to the center of the circle as hypotenuse;
While the radius and the length of the tangent to the circle as the other sides
Using Pythagoras’ theorem, the square of the hypotenuse equals the sum of the squares of the two other sides
Let the length we want to calculate be x
x^2 = 3^2 + 4^2
x^2 = 9 + 16
x^2 = 25
x = √25
x = 5 cm
Ответ:
The answer is A. y=2x+4
Step-by-step explanation:
The y-intercept is on positive 4, so the equation will end with +4. the rise over the run is 2/1, which is simplified to 2. So 2x. So the answer is y=2x+4.
Hope this helped.