6-3 similar figures and scale drawing
TRANSCRIPT
Warm-upMonday, October 26, 2009
Solve each proportion. Round to the nearest tenth where necessary.
a.) b.)
c.) d.) gp
p
f
20
3
16
15
4
9
50
8
3
213
2
6-3 Similar Figures and Scale Drawings
Objectives: You will be able to solve problems that involve similar figures
You will be able to solve problems that involve scale drawings
equalproportion
the same shape, but not necessarily the same size; corresponding angles & sides
using similar figures to compare distances that are difficult to measure directly
an enlarged or reduced drawing that is similar to an actual object or place
similar to; the same shape, but not the same size (necessarily).
Today’s bonus
• Using indirect measurements with shadows, similar figures, and some knowledge of angles, Erotosthenes (276 – 195 BC) calculated the circumference of the Earth with surprising accuracy.
When are we ever going to use this?
• Here are some ideas:– Architecture– Making or using maps– Movie making– Surveying– Manufacturing
Finish the Quick Check before the end of class!
Homework
• Please complete pg. 301 (305) #1-19 ODD
• REMEMBER…– Odd problems have answers in the back of the
book, so you must show your work to receive full credit on your homework!!!
Ticket to Leave
A tree casts a shadow 8 feet long. A 6-ft man casts a shadow 4 ft long. The triangle formed by the tree and its shadow is similar to the triangle formed by the man and his shadow. How tall is the tree?
8
x
4
6