Week 12 day 1

2

The graph shows the height of a tennis ball from the time it is served to the time it hits the ground on the other side of the net. How many seconds elapse while the ball is 7 feet or more above the ground?

Record your answer and be sure to use the correct place value.

0

2

4

6

8

.2 .4 .6 .8 1.0 1.2 1.4 1.6 1.8time (s)

heig

ht (

ft)

•

8.2 8.2 Special Special Right Right

TrianglTriangleses

450-450-900 Triangle Theorem

In a 450-450-900 triangle, both legs are congruent and the length of the hypotenuse is 2 times the

length of a leg.

hypotenuse =2leg450

450

s

s

s2

PardekooperPardekooper

Lets try a problemLets try a problem

450

450

9

h

h=9h=922

h=12.72h=12.72

PardekooperPardekooper

Lets try one moreLets try one more

450

450

22

h

h=2h=22222

h=4h=4

PardekooperPardekooper

HereHere’’s one for s one for baseball.baseball.A high school baseball diamond is a A high school baseball diamond is a square. The distance from base to square. The distance from base to

base is 90 ft. To the nearest foot, how base is 90 ft. To the nearest foot, how far does the catcher throw the ball far does the catcher throw the ball from home plate to second base ?from home plate to second base ?

90 ft.

x ft.x=90x=9022

x=126.9x=126.9

x=127x=127PardekooperPardekooper

300-600-900 Triangle Theorem

In a 300-600-900 triangle, the length of the hypotenuse is twice the length of the

shorter leg. The length of the longer leg is 3 times the length of the shorter leg..

hypotenuse =2shorter leg

longer leg= 3shorter leg

600

300

s2s

s3PardekooperPardekooper

Lets try a problemLets try a problem

h=2(5)h=2(5)

h=10h=10

600

300

5h

l

l=5l=533l=8.65l=8.65

h=2sh=2s l=sl=s33

PardekooperPardekooper

HereHere’’s anothers another

8=2s8=2s2 22 2

600

300

s8

l

l=4l=433l=6.92l=6.92

h=2sh=2s l=sl=s33

4=s4=s

PardekooperPardekooper

Just one moreJust one more

450300

72

b

ac

d

h=sh=s22

h=7h=722

s=7s=7

d=7d=7

c=7c=7

h=2sh=2sh=2(7)h=2(7)h=14h=14

a=14a=14

l=sl=s33l=7l=733l=12.11l=12.11

b=12.11b=12.11

PardekooperPardekooper

Workbook P.Workbook P. 399399

PardekooperPardekooper

AssignmentWorkbook

Page 399 all