Centre, radius
Difficulty: ★☆☆Centre, radius
Difficulty: ★☆☆Centre, radius
Difficulty: ★☆☆Centre
Difficulty: ★★☆Centre, radius
Difficulty: ★★☆Centre
Difficulty: ★★☆Circle equations and tangents: check 1
Difficulty: ★★☆Info
Maths4U Original · Short practice
Find the radius of \((x-4)^2+(y+2)^2=49\).Enter one number or fraction. Round decimals to at least six decimal places when needed.
Circle equations and tangents: check 2
Difficulty: ★★☆Info
Maths4U Original · Short practice
Find the x-coordinate of the centre of \(x^2+y^2-6x+8y=0\).Enter one number or fraction. Round decimals to at least six decimal places when needed.
Circle equations and tangents: check 3
Difficulty: ★★☆Info
Maths4U Original · Short practice
A circle has diameter endpoints \((-2,1)\), \((4,9)\). Find its radius.Enter one number or fraction. Round decimals to at least six decimal places when needed.
Circle equations and tangents: check 4
Difficulty: ★★☆Info
Maths4U Original · Short practice
The circle \(x^2+y^2=25\) has tangent at \((3,4)\). Which equation is that tangent?Choose one answer.
Circle equations and tangents: check 5
Difficulty: ★★☆Info
Maths4U Original · Short practice
AB is a diameter of a circle and C is a different point on that circle. What is angle ACB?Choose one answer.
Circle equations and tangents: review variant 1
Difficulty: ★★☆Info
Maths4U Original · Short practice
Find the radius of \((x+3)^2+(y-1)^2=36\).Enter one number or fraction. Round decimals to at least six decimal places when needed.
Circle equations and tangents: review variant 2
Difficulty: ★★☆Info
Maths4U Original · Short practice
Find the centre x-coordinate of \(x^2+y^2+4x-10y+4=0\).Enter one number or fraction. Round decimals to at least six decimal places when needed.
Circle equations and tangents: review variant 3
Difficulty: ★★☆Info
Maths4U Original · Short practice
A diameter has endpoints \((0,0)\), \((10,24)\). Find the radius.Enter one number or fraction. Round decimals to at least six decimal places when needed.
Circle equations and tangents: review variant 4
Difficulty: ★★☆Info
Maths4U Original · Short practice
Find the tangent gradient to \(x^2+y^2=25\) at \((4,3)\).Enter one number or fraction. Round decimals to at least six decimal places when needed.
Circle equations and tangents: review variant 5
Difficulty: ★★☆Info
Maths4U Original · Short practice
AB is a circle diameter. C is another point on the circle. If angle ABC is \(28^\circ\), find angle BAC in degrees.Enter one number or fraction. Round decimals to at least six decimal places when needed.