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postnew [5]
3 years ago
11

What is the surface area of the regular pyramid below?

Mathematics
2 answers:
kkurt [141]3 years ago
8 0

Answer:

648 sq units

Step-by-step explanation:

Area of the base= 12×12= 144 sq. units

Perimeter of the base=4×12= 48

Total surface area= 1/2×48×21 + 144

=648 sq units

Vlada [557]3 years ago
5 0

ANSWER

648 square units.

EXPLANATION

The surface area of the regular pyramid is the area of the base plus the area of the 4 triangular faces.

We use the formula;

S.A =  {l}^{2}  + 4 \times  \frac{1}{2} bh

where l=12 units is the length of the square base and h=21 units is the vertical height of the triangular faces.

We substitute the values to get;

S.A =  12^{2}  + 4 \times  \frac{1}{2}  \times 12 \times 21

S.A =  144+ 504

S.A =648 {units}^{2}

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If you have 63 books and you donate 1/3 of you’re books how many will you have left
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3 years ago
Triangle ABC has been reflected over the x-axis to create triangle A'B'C'. Which of the following statements is true?
Leto [7]

Answer:

A ' = (-2, -3)

B ' = (0, -3)

C ' = (-1, 1)

=======================================================

Explanation:

To apply an x axis reflection, we simply change the sign of the y coordinate from positive to negative, or vice versa. The x coordinate stays as is.

Algebraically, the reflection rule used can be written as

Applying this rule to the three given points will mean....

Point A = (-2, 3) becomes A ' = (-2, -3)

Point B = (0, 3) becomes B ' = (0, -3)

Point C = (-1, -1) becomes C ' = (-1, 1)

The diagram is provided below.

Side note: Any points on the x axis will stay where they are. That isn't the case here, but its for any future problem where it may come up. This only applies to x axis reflections.

Step-by-step explanation:

7 0
3 years ago
Plz solve this fast I want to submit at 7:00
gtnhenbr [62]

Answer:

i) 2,4,6=2,4,6

ii) (1,2,3,4,5,6,2,4,6,8)= (1,2,3,4,5,6,2,4,6,8)

iii)3,5 (1,2,4,4,6,8)= (2,4,6) (4)

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Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
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Harman [31]

Answer:

Step-by-step explanation:

1125*3=3375

The first diagram shows how to multiply each number separately instead of the normal way. It shows you in sections instead one line.

The question asks if you started with the first "1" in 1125, will the answer be different. The answer is no.  

since the hundred number given, when multiplied by the 3, will not result in "carrying the 1 over to the thousand place, the answer will not change.

5 0
3 years ago
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