Activity 7.1: Equation of a Circle

In the equation (x+2)² + (y-3)²=4, the radius of the circle is...

• 4
• 3
• 2
• 16

In the equation (x-4)² + (x-3)² = 25, the radius is

• 4
• 5
• 3
• 25

In the equation (x-3)² +(y-2)² =16, the center of the circle is...

• (3,2)
• (-2, -3)
• (-3, -2)
• (2, 3)

Write the equation of a circle with center (0, 7) with radius 3.

• x² + (y -7)² = 3
• x² + (y -7)² = 9
• (x - 7)² + y² = 3
• (x - 7)² + y² = 9

What is the radius of the circle (x+7)²+(y-2)²=144?

• 7
• 13
• 12
• 144

What is the center of the circle with this equation is (x+2)²+(y-4)²=41?

• (2,-5)
• (-2,4)
• (2,-4)
• (-2, -4)

What are the coordinates of the center and the radius of the circle with equation: (x - 4)² + (y - 3)² = 25 ?

• Center (4,3) , Radius = 5 units
• Center (4,3) , Radius = 25 units
• Center (-4,-3) , Radius = 25 units
• Center (-4,-3) , Radius = 5 units

Write the equation of a circle with center (7, 0) with radius 3.

• x² + (y -7)² = 9
• (x - 7)² + y² = 3
• (x - 7)² + y² = 9
• x² + (y -7)² = 3

Which of the following is the equation of a circle with a radius of 5 and a center (-3,2) ?

• (x-3)² + (y+2)² = 25
• (x+3)² + (y-2)² = 25
• (x+3)² + (y-2) = 5
• (x-3)² + (y+2)² = 5

Write the equation of the circle with center at the origin (0,0) and a diameter of 10.

• x²+y²=10
• x²+y²=100
• x²+y²=5
• x²+y²=25