Symmetry of a semicircle

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

Let XY be the diameter of a semicircle with centre O. Let A be a variable point on the semicircle and B another point on the semicircle such that AB is parallel to XY. The value of angleBOY for which the inradius of triangle AOB is maximum, is

What is the measure of a semicircle ?

What is the measure of a semicircle ?

Area: circumference and perimeter of semicircle

A wire of length 36 cm is bent in the form of a semicircle. What is the radius of the semicircle?

Perimeter of semicircle is …………….. Units .

A wire of length l and mass m is bent in the form of a semicircle. The gravitational field intensity at the centre of semicircle is

A copper wire is bent in the shape of a square of area 81cm. If the same wire is bent in the form of a semicircle, the radius (in cm) of the semicircle is