Question

what is the answer of this question ​

Answer 1

Answer:

20 cm

Step-by-step explanation:

by pythagorous theorem

Answer 2

Answer:

Step-by-step explanation:

Draw a circle, and label the center.

Draw the radius of 25cm, the diameter of 50cm.

Now draw a chord of 40 cm.  Half the chord is 20 cm.  These lines should be parallel.

Draw a line from the center to the point where the chord touches the circle.

Now draw a line perpendicular to the diameter and the chord at the point where the chord and circle intersect.

You've now created a right triangle where the hypothenuse is the diagonal line from the circle center to the point where the chord meets the circle.  Its measure is 25 cm.  The base of the triangle is half the chord, 20 cm.  And, the height of the triangle is the distance between the diameter/radius and the chord.  This is what we need to find, which we can call x.

Next, we simply use the Pythagorean theorem to solve for x!

x^2 + b^2 = c^2

x^2+20^2=25^2

x^2+400=625

sqrt(x^2) = sqrt(225)

x=15

The chord is 15 m from the center of the circle. So the answer is B.