Angles in circles
All angles in a semi circle are 90
The angle subtended at the centre is twice
the angle at the circumference
the angle at the circumference
A tangent is a line
which touches the
circle and makes an angle
Of 900 with the radius of the circle
which touches the
circle and makes an angle
Of 900 with the radius of the circle
Centre of circle
Diameter (twice the radius)
Area of a circle = 𝜋
X r2