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Vanyuwa [196]
3 years ago
8

Find the surface area of the regular triangular pyramid.

Mathematics
1 answer:
crimeas [40]3 years ago
7 0
The surface of the pyramid: base + surface area of the sides.

The base area is:

By Heron formula,
s=8+8+8/2
=12

_/12(12-8)(12-8)(12-8)
=_/12(4)(4)(4)
=_/768
=27.7128..
≈27.71sq.units

The side surface areas:
(18×8/2)×3
=144/2×3
=216 sq.units

The total surface area:
216+27.71
=243.71 sq.units

Thus, 243.71 sq.units is the answer.

Hope it helps!
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Please help!
victus00 [196]

Answer:

70° is the answer hope it helps

30°+90°+ 3y= 180°

120°+3y= 180°

3y= 180°-120°

y= 60°/3

y= 20°

Now

y°+90°+x°= 180°

20°+90°+x= 180°

x= 180°-110°

x= 70°

7 0
2 years ago
Read 2 more answers
Find the ratio of 3 3/4 to 7 1/4
Sergio039 [100]

Answer:

  15 : 29

Step-by-step explanation:

  (3 3/4) / (7 1/4) = ((3·4+3)/4) / ((7·4+1)/4)

  = (15/4) / (29/4) = 15/29

The ratio of the two numbers is 15 : 29.

5 0
3 years ago
The sum of the two digits of a number is 16. The number formed by reversing the digits is 18 more than the original number. Dete
nydimaria [60]
9u-9t=18

original no. is 10t+u
reversed no. is 10u+t

so its (10u+t)-(10t+u)=18
which gives 9u-9t=18
5 0
3 years ago
Samantha says that two of three points below are on a line through the origin. (3,8), (6,21), and (9,24)
Thepotemich [5.8K]

Answer:

Yurrrrrrrrrrrrrrrrrrrrrrr

Step-by-step explanation:

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4 0
3 years ago
BRAINLIEST ASAP! PLEASE HELP ME :)
marta [7]
<h3>Answer: C) none of the equations are identities</h3>

If you plugged theta = 0 into the first equation, then you would have

sin(45) + cos(45) = sin(0) + cos(0)

sqrt(2) = 1

which is a false equation. We don't have an identity here.

The same story happens with the second equation. Plug in theta = 0 and it becomes

cos(60) - sin(60) = cos^2(0) + tan(0)

1/2 - sqrt(3)/2 = 1 + 0

-0.37 = 1

which is false.

6 0
3 years ago
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