On Tuesdays I upload an update of what we did in math for the week.

RightStart Geometry:

Lesson 78 Finding the Area of a Circle

TYPO ALERT! At the end of the lesson is a box which has various values for pi. The student is to compare the accuracy of these values. One of the values given is 335 over 113; it should read 355 over 113. The correct values are mentioned in the lesson, so it’s pretty easy to catch.

Other than that, the lesson deals with finding areas of squares and areas of circles. Morgan makes a return appearance, setting a round watering system in a square field -- what percent of the field is watered? (This is a good time to see how well your student remembers how to calculate percents.) I continue to believe that Morgan needs to get over this obsession with sticking circles in the middle of things.

Lesson 79 Finding More Areas

TYPO ALERT! On the second worksheet, problem 5 says to “Find the length of a side of a square that has twice the perimeter of the square below. Draw the square.” Then problem 6 says to “Find the length of a side of a square that has twice the perimeter of the square below. Draw the square.” Problem 6

*should*read “a square that has twice the

*area*of the square below.”

Also, we could not get the answer on the answer sheet for problem 2. Using the same measures and values, we came up with a percent covered by the design as 70.7% rather than 70.1% (unless we set pi as 3.17 ... yes, out of curiosity, I worked the problem backwards).

No new information is presented in the lesson. It’s just a bunch of problems. The problems are well written (other than the typos). Kid1 remarked that she would like a calculator with a pi key. MrV has one, of course, but I think for now we’ll keep tapping in 3.14.

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