Question

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Answer 1

Resposta:1) 15/5=30/x

15.x=5 .30

15.x=150

x=150/15

x=10

x/1=3/2

2.x=3.1

x=3/2

2)A(3,2) e B=(7,8)

d=$\sqrt{\((xb-xa)^2+(yb-ya)^2$

d=$\sqrt{(7-3)^2+(8-2)^2$

d=$\sqrt{4^2 + 6^2$

d=$\sqrt{52$

d=2√13

3)sen 45°= x/10

√2/2=x/10

2.x=10√2

x=10√2/2

x=5√2

sen30°=h/36

1/2=h/36

2.h=36

h=36/2

h=18

4)A=(R² - r²).π

A=(7²-3²).π

A=(49-9).π

A=40π cm²

5)A=2.π.r²+2.π.h

A=2.π.2²+2.π.10

A=8.π +20.π

A=28.π cm²

V=π.r².h

V=π.2².10

V=π.4.10

V=40.π cm³