Dedicated to my wonderful family,and my wonderful Savior Jesus Christ.
-A. A.
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John and Sally were walking through the woodsdown their favorite path to their favorite picnic spot.
2
“I can’t wait until we get to themeadow for our picnic. “
“Me either.“ 3
However, something suddenlystopped them on the path.
“Oh, no! There’s a log inthe middle of the road. “
“Oh, no! We’ll never be ableto get to the meadow if this log
is in the way.”
4
John and Sally couldn’t get around thelog, but they suddenly noticed something
when they looked closely at it.
“This log is a puzzle. Maybe if we canfigure it out, it’ll move out of the way for us.”
“Maybe it will.” 315
31
The two friends continued to look at the strangelog. They noticed that it lied diagonally across
the pathway.
“It’s a transversal.” 
“What’s a transversal?” 6
31
“A transversal is a line thatintersects, or crosses, two
parallel lines.”
“What are parallel lines?” 7
The red line in this picture is thetransversal of the other two black
lines in the picture.
8
The two friends continued looking at thelog, and Sally noticed another clue.
“This log has numbers cut into itssides. They’re on every corner.
There’s a 1, a 2, and a 3. They’re
on every corner except this one to my
left. There’s a 45 on that side as well.”
“You’re right! Thismust be another clue!”31
9
“I found some weird cardswith numbers on them as well.
Maybe they’re a clue too!”
“Absolutely!” 31
10
John and Sally thought about whatthe numbers, the log’s strange position,
the unusual 45 carving, and the numbered
cards could mean. Finally, it came to them.
“I’ve got it!” “You’ve got what?” 3111
31
“The answer to the riddle!I know how to solve it!”
“Well, how doyou solve it?”
12
31
“Well, how do you solve it?” 
“You solve the riddle by finding the measureof the angles created by the pathway and the
log. I think we can find the measure of the
angles by using alternate interior angles.”
13
“Alternate what?”
“Alternate interior angles.”
3114
31
“When a transversal, or another line,crosses a pair of parallel lines, it creates
alternate interior angles.”
“Oh, okay.”15
31
“Alternate interior anglescan be found at the top and
bottom of every transversal.”
“Amazing!”16
The green part of this pictureis an example of alternate
interior angles.
17
31
“I remembered that alternate interiorangles are congruent, or equal to each
other. Which means that if we know
one angle, we can find them all and
solve the puzzle!”
“Yay! Okay, sowhere do we begin?”
18
31
“Well, one corner of the log has a 45 on it. That must mean that that angle has a measure
of 45°, and since alternate interior angles are
congruent, the side with the 1 on it must
be a 45° angle too!”
“Amazing, but how dowe find the other angles?
19
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"John and Sally Move the Big Log"
John and Sally encounter a log puzzle in the woods. They learn about transversals, alternate interior angles, and solve the puzzle to continue their picnic.
(31 pages)
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