ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos


Geometry Videos 251 videos

Surface Area of Cylinders
14741 Views

Haven't you always wondered how much cardboard it takes to encase a trunk warmer for your pet elephant?

Perimeter of Irregular Shapes
4864 Views

Want to figure out the area and perimeter of irregular shapes? Break them down into regular shapes. For example, a flower can be broken down into s...

Introduction to 3D Geometry
55503 Views

It's one thing when all those shapes are sitting flat on the page. But when they start popping out and invading our personal space bubble, we get a...

See All

ACT Math 2.5 Coordinate Geometry 231 Views


Share It!


Description:

ACT Math: Coordinate Geometry Drill 2, Problem 5. What is the origin of the circle?

Language:
English Language

Transcript

00:02

For a good time, solve this shmoopy question.

00:05

A circle has the equation (x - 3)2 + (y + 7)2 = 49.  What is it's origin?

00:13

And here are your potential answers...

00:17

Okay, so this is just testing to see if we know the standard formula for a circle.

00:21

The formula of a circle is the quantity x minus h squared plus the quantity y minus

00:26

k squared equals r squared, where (h, k) is the origin. Ok... so we want to find h and k...

00:32

And it looks like h is 3... and k is negative 7...Why?

00:37

Because two negatives make a positive 7 in the equation.

00:40

Our origin is (3, -7). Looks like our answer is C.

Related Videos

ACT Math 3.1 Plane Geometry
2559 Views

ACT Math: Plane Geometry Drill 3, Problem 1. What is the area of the trapezoid shape in the video?

Inequalities in Number Lines
3229 Views

ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?

ACT Math 3.1 Intermediate Algebra
1955 Views

ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.

Surface Area of Cylinders
14741 Views

Haven't you always wondered how much cardboard it takes to encase a trunk warmer for your pet elephant?

Perimeter of Irregular Shapes
4864 Views

Want to figure out the area and perimeter of irregular shapes? Break them down into regular shapes. For example, a flower can be broken down into s...