# Plane Geometry

## The Growing Ground Swell

You may not have realized it, but Oregon has four of the 18 most active volcanoes in the United States. What percent of the country’s most active volcanoes is *not* in Oregon? Express your answer to the nearest whole percent.

## Father's Day

For Father’s Day, Martin’s family is having a barbeque. Martin is making the lemonade. If the directions calls for 2 tablespoons of mix per quart of water, how many tablespoons of mix are needed to make 1.5 gallons of lemonade?

## Fly a Kite

Molly has sketched a design for her new kite on a coordinate grid. The sides of her quadrilateral kite design are given by the equations *y* = (2/3)*x* + 30, *y* = (−2/3)*x* + 50, *y* = −2*x* + 30 and *y* = 2*x* – 30. How many square units are in the area of Molly’s design?

## The Road to Nationals

“Job well done!” to all the Mathletes^{®} who participated in the MATHCOUNTS Competition Series at the school, chapter and state levels. And congratulations to the 224 students who are headed to Orlando next month to compete in the 2019 Raytheon MATHCOUNTS National Competition! Let’s look at some of the challenging problems competitors faced on the road to Nationals!

__School Target #8__

## Combining Shapes

The radius of circle N is 3 inches, and the radius of circle O is 4 inches. What is the radius of circle P whose area is the sum of the areas of circles N and O?

## Space Junk

Space junk is debris orbiting Earth that, for the most part, has been abandoned or has broken off spacecrafts and rockets. Some of these items are far enough from Earth that they will remain in orbit forever; however, much of this “junk” will be pulled into Earth’s atmosphere by gravity. On average, one item per day falls victim to gravity. At this rate, in what year will 2500 pieces of space junk enter the atmosphere if we begin counting on February 18th?

## Geometry of Gift Giving

Vanessa bought some round holiday dessert plates to give as a gift to her friend. However, the store only had 5 of the 8 plates she wanted. (All of the plates are the same.) The stack of five plates measured 1.5 inches tall, and when two plates were removed from the stack the remaining stack of three plates had a height of 1 inch. When Vanessa finally has all 8 of the plates she wants, how tall will the stack of 8 plates be, in inches? Express your answer as a decimal to the nearest hundredth.