Radius of a circle is 10 cm. What will be the angle made by a chord of length 20 cm on the circumference of this circle ?

90 degree

R = 10 cm

So, Diameter = 2 x R = 2 x 10 = 20 cm

ACT

Chord = 20 cm

As diameter divides the circle into two semi circle each having an angle of 90 degrees at the circumference of the circle.

SO, he angle made by the chord (diameter in this case) at the circumference of te circle is 90 degrees.

Therefore, answer is 90 degrees.