unit 1 day 8

unit 1 day 8 scale factor of sides and scale factors of area


https://www.youtube.com/watch?v=MjsQn2RGQho


https://www.youtube.com/watch?v=MjsQn2RGQho


Quiz
1 24 to 8 is 12 to x
2 26 to 10 is 13 10 x
3 30 to 10 is 15 to x

answers
1 find the area  what it would be the with. the smaller one is 4
2 x= 5
3 x = 5



TIPS FROM THE PROS

http://www.youtube.com/watch?v=z1DifHKdueY

unit 1 day 7

unit 1 day 7 similar triangles proportion


https://www.youtube.com/watch?v=LZ52UKfu1mo


Quiz
1 the picture
2 10 to 5 2 to x
3 15 to 10  4 to x

answers
1 9 / 6  3/ x  9 divide 3 is 3 6/ 3 is 2 x= 2
2 x=1
3 x= 2.66

Unit 1 day 6

 Unit 1 day 6 similar triangles angle angle

https://www.youtube.com/watch?v=wlMuiKCYoWs

Quiz
1 a is 65 b is 53
2 A= 47 B= 74
3 A= 79 B= 89

answers
1 c = 64 you get the two numbers and add them then subtract 180 to find last point
2 59
3 12

unit 1 day 5

unit 1 day 5 similar figures What are they and finding missing lengths

http://www.youtube.com/watch?v=1UuiF3mskQA



If two objects have the same shape, they are called "similar." When two figures are similar, the ratios of the lengths of their corresponding sides are equal. To determine if the triangles shown are similar, compare their corresponding sides. Are these ratios equal?

Quiz 

1 there are two similar triangle  one is 15 tall and 20 long the other is 10 tall and (x)

2 20x 25 15 x (x)

3 30 x 15 20 x (x) 

Answer

1 15/ 20 is to 10/x cross multiply 15x/15= 200/ 15 then divide to get 13.3  

2 18.75

3 10

unit 1 day 4

unit 1 day 4 surface area of prism, pyramid, cylinder, cone, sphere
https://www.youtube.com/watch?v=cAxHYFRx1Fs

Prism in real life



pyramind










cylinder



cone






sphere





Quiz
1 the diameter of the concrete sphere is 30
2 the tisusse box is l = 10 w= 20 h= 10
3 the R is 15 and the H is 20 of a cylinder

answer
1 4 Pi r^2= 2827.43
2 1000 units ^2
3 a= 2 Pi R^2 + 2 Pi R*H = 3298.67

unit 1 day 3

unit 1 day 3 surface area of prism, pyramid, cylinder, cone, sphere


http://www.youtube.com/watch?v=gi7aaZ87EoQ

Quiz
1 radius of a sphere is 30 whats the surface area 
2 If a prism l= 10 h= 10 w= 20 
3 if the R is 15 of a sphere

answers
1 4 Pi r^2 = 11309.73
2 1000
3 2827.43

Unit 1 Day 2

Unit 1 Day 2:  area from day 2 and introduce concept of scale.



http://www.youtube.com/watch?v=EQKKA5NBHik
Quiz
1 If the scale of a whole is 1 what is half that
2  quarter
3 third

answers
1 1/50 half of 1 whole is 1/50 which is the scale
2 1/25
3 1/33