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4 years ago

A regular triangular pyramid has a base area of 31.5 mm2 and a surface area of

Mathematics

1 answer:

Virty [35]4 years ago

6 0

Answer:

A) 220.5 mm^2

Step-by-step explanation:

<u>Explanation</u>:-

Given A regular triangular pyramid has a base of area is 31.5mm^2

and also given surface area of triangular pyramid is 252 mm ^2

by using formula

surface area of regular triangular pyramid = base of area + half of lateral surface.

$surface area = area of the pyramid X \frac{1}{2} lateral surface$

252 = 31.5 + $\frac{1}{2} lateral surface$

$252-31.5= \frac{1}{2} lateral surface$

220.5 = lateral area of triangular pyramid

lateral area of triangular pyramid = 220.5 mm^2

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Idk how to do this plz help me!!

Valentin [98]

Answer:

A. 130 degrees

B. 50 degrees

Step-by-step explanation:

A. It's a straight line so the angle is 180. U subtract 50 from. 180 and u get 130

B. It 50 because it's vertically opposite angle to angle AEC

7 0

3 years ago

Read 2 more answers

What is the geometric mean of 5 and 10?

nlexa [21]

Answer:

5 $\sqrt{2}$

Step-by-step explanation:

The geometric mean of 2 numbers a and b is

$\sqrt{ab}$

Hence

The geometric mean of 5 and 10 is

$\sqrt{5(10)}$

= $\sqrt{50}$

= $\sqrt{25(2)}$ = $\sqrt{25}$ × $\sqrt{2}$ = 5 $\sqrt{2}$

4 0

4 years ago

Read 2 more answers

A store sells gift cards in preset amounts.You can purchase gift cards for $10 or $25. You have spent $285 on gift cards. Erie a

pav-90 [236]

Answer:

10x + 25y = 285

One $25 gift cards with 26, $10 gift cards.

Three $25 gift cards with 21, $10 gift cards and

Five $25 gift cards with 16, $10 gift cards.

Step-by-step explanation:

I can purchase gift cards for $10 or $25. I have spent $285 on gift cards.

If I have purchased x number of $10 gift cards and y number of $25 gift cards then the equation that models the situation in standard form will be given by

10x + 25y = 285 .......... (1)

Now, for y = 1, x = 26

For, y = 3, x = 21

For, y = 5, x = 16

So, here are the three combinations of gift cards that I could have purchased.

One $25 gift card with 26, $10 gift cards.

Three $25 gift cards with 21, $10 gift cards and

Five $25 gift cards with 16, $10 gift cards. (Answer)

8 0

3 years ago

Please hellppp please help

vfiekz [6]

Answer:

Below.

Step-by-step explanation:

a. 5 * 1000 = 5,000 micrometers

b. 5000 / 1000 = 5 kg

c. 4.23 * 10^12 = 4,230,000,000,000 picograms

d. 1.9 ^ 10^9 = 1,900.000,000 nanoseconds.

e. 2.3 million.

5 0

4 years ago

The width of rectangular solid is 20ft, which is 4/5 of its length. The height of it is 2/9 of the sum of the length and width.

lilavasa [31]

Let L and H represent length and height, respectively.
.. 20 ft = (4/5)*L
.. L = (5/4)*(20 ft) = 25 ft . . . . . . . . multiply by the reciprocal of the coefficient of L

.. H = (2/9)*(L +20 ft)
.. = (2/9)*(25 ft +20 ft))
.. = (2/9)*(45 ft) = 10 ft

The volume is the product of length, width, and height.
.. V = (25 ft)*(20 ft)*(10 ft) = 5000 ft^3

6 0

3 years ago