" J.The angle in a semicircle measure "

The angle in a semicircle measures

The measure of the angle in a semicircle is

Prove that the angle in a semicircle is right angle. (By vector method)

The angle subtend by a semicircle at the centre is _________.

Prove analytically : An angle in a semicircle is a right angle.

Using vectors, prove that angle in a semicircle is a right angle.

The angle subtend by a semicircle at the remaining part of the circumference is __________.

PQ is a diameter of a semicircle with radius 7.5 cm. and anglePQR is the angle on the semicircle. If PR = 9cm. Then the length of QR is