Quiz 30, Units 13-14 Flashcards Preview

7th math > Quiz 30, Units 13-14 > Flashcards

Flashcards in Quiz 30, Units 13-14 Deck (12):
1


write the ratio:

sine


s = o/h

2


tangent


t = o/a

3


cosine


c = a/h

4


Pythagorean rule


c2 = a2 + b2

5


volume of a cube


V = e3

6


surface area of a rectangular solid


SA = 2lw + 2wh + 2lh

7


volume of a square pyramid


V = 1/3lwh

8


volume of a cone


V = 1/3pir2h

9


Find the length of the hypotenuse if the legs are 3 m & 4 m.


Use the Pythagorean rule:

c2 = a2 + b2

c2 = 32 + 42

c2 = 9 + 16

c2 = 25

c = 5 m

10


Find the length of one leg if the hypotenuse is 10 m and the other leg is 6 m.


c2 = a2 + b2

100 = 36 + b2

64 = b2

8 = b

11


Find the volume of a rectangular solid that is 7 ft. long, 6 ft. wide, and 5 ft. high.


V = lwh

V = 7 x 6 x 5

V = 210 cu. ft.

12


Find the surface area of a cube that is 4 in. on each edge.


SA = 6e2

SA = 6 x 42

SA = 6 x 16

SA = 96 sq. in.