unit 1 Day 5:

Day 5: similar figures ,what are they and finding missing lengths.
Similar figures-Two geometrical objects are called similar if they both have the same shape. More precisely, one is congruent to the result of a uniform.
Explanation-http://youtu.be/rsK6pbqU6uo
Examples-

Finding the missing lengths-http://youtu.be/1UuiF3mskQA
Examples:

Quiz :
1)Old Faithful in Yellowstone National Park shoots water 60 feet into the air that casts a shadow of 42 feet. What is the height of a nearby tree that casts a shadow 63 feet long? Assume the triangles are similar.

2)Rob enlarged a 4 in. wide by 7 in. tall picture into a banner. If the banner is 3.5 ft wide, how tall is it?

A. 6.05 ft

B.6.125

C. 7 ft        

D. 7.125 ft

3)A painting 40 in. long and 56 in. wide is to be scaled to 10 in. long to be displayed on a poster. How wide should the painting be on the poster for the two pictures to be similar?

Key:
1)Tree Old Faithful

_x =_60 height 63 42 shadow
42x = 60(63) Find the cross products. 42x = 3,780 Simplify.
x = 90 Divide each side by 42. The tree is 90 feet tall.
 2)B

3)The painting displayed on the poster should be 14 in. long.